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(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
    typeof define === 'function' && define.amd ? define(['exports'], factory) :
    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.sourceMap = {}));
})(this, (function (exports) { 'use strict';

    const comma = ','.charCodeAt(0);
    const semicolon = ';'.charCodeAt(0);
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    const intToChar = new Uint8Array(64); // 64 possible chars.
    const charToInteger = new Uint8Array(128); // z is 122 in ASCII
    for (let i = 0; i < chars.length; i++) {
        const c = chars.charCodeAt(i);
        charToInteger[c] = i;
        intToChar[i] = c;
    }
    // Provide a fallback for older environments.
    const td = typeof TextDecoder !== 'undefined'
        ? new TextDecoder()
        : typeof Buffer !== 'undefined'
            ? {
                decode(buf) {
                    const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
                    return out.toString();
                },
            }
            : {
                decode(buf) {
                    let out = '';
                    for (let i = 0; i < buf.length; i++) {
                        out += String.fromCharCode(buf[i]);
                    }
                    return out;
                },
            };
    function decode(mappings) {
        const state = new Int32Array(5);
        const decoded = [];
        let line = [];
        let sorted = true;
        let lastCol = 0;
        for (let i = 0; i < mappings.length;) {
            const c = mappings.charCodeAt(i);
            if (c === comma) {
                i++;
            }
            else if (c === semicolon) {
                state[0] = lastCol = 0;
                if (!sorted)
                    sort(line);
                sorted = true;
                decoded.push(line);
                line = [];
                i++;
            }
            else {
                i = decodeInteger(mappings, i, state, 0); // generatedCodeColumn
                const col = state[0];
                if (col < lastCol)
                    sorted = false;
                lastCol = col;
                if (!hasMoreSegments(mappings, i)) {
                    line.push([col]);
                    continue;
                }
                i = decodeInteger(mappings, i, state, 1); // sourceFileIndex
                i = decodeInteger(mappings, i, state, 2); // sourceCodeLine
                i = decodeInteger(mappings, i, state, 3); // sourceCodeColumn
                if (!hasMoreSegments(mappings, i)) {
                    line.push([col, state[1], state[2], state[3]]);
                    continue;
                }
                i = decodeInteger(mappings, i, state, 4); // nameIndex
                line.push([col, state[1], state[2], state[3], state[4]]);
            }
        }
        if (!sorted)
            sort(line);
        decoded.push(line);
        return decoded;
    }
    function decodeInteger(mappings, pos, state, j) {
        let value = 0;
        let shift = 0;
        let integer = 0;
        do {
            const c = mappings.charCodeAt(pos++);
            integer = charToInteger[c];
            value |= (integer & 31) << shift;
            shift += 5;
        } while (integer & 32);
        const shouldNegate = value & 1;
        value >>>= 1;
        if (shouldNegate) {
            value = -0x80000000 | -value;
        }
        state[j] += value;
        return pos;
    }
    function hasMoreSegments(mappings, i) {
        if (i >= mappings.length)
            return false;
        const c = mappings.charCodeAt(i);
        if (c === comma || c === semicolon)
            return false;
        return true;
    }
    function sort(line) {
        line.sort(sortComparator$1);
    }
    function sortComparator$1(a, b) {
        return a[0] - b[0];
    }
    function encode(decoded) {
        const state = new Int32Array(5);
        let buf = new Uint8Array(1024);
        let pos = 0;
        for (let i = 0; i < decoded.length; i++) {
            const line = decoded[i];
            if (i > 0) {
                buf = reserve(buf, pos, 1);
                buf[pos++] = semicolon;
            }
            if (line.length === 0)
                continue;
            state[0] = 0;
            for (let j = 0; j < line.length; j++) {
                const segment = line[j];
                // We can push up to 5 ints, each int can take at most 7 chars, and we
                // may push a comma.
                buf = reserve(buf, pos, 36);
                if (j > 0)
                    buf[pos++] = comma;
                pos = encodeInteger(buf, pos, state, segment, 0); // generatedCodeColumn
                if (segment.length === 1)
                    continue;
                pos = encodeInteger(buf, pos, state, segment, 1); // sourceFileIndex
                pos = encodeInteger(buf, pos, state, segment, 2); // sourceCodeLine
                pos = encodeInteger(buf, pos, state, segment, 3); // sourceCodeColumn
                if (segment.length === 4)
                    continue;
                pos = encodeInteger(buf, pos, state, segment, 4); // nameIndex
            }
        }
        return td.decode(buf.subarray(0, pos));
    }
    function reserve(buf, pos, count) {
        if (buf.length > pos + count)
            return buf;
        const swap = new Uint8Array(buf.length * 2);
        swap.set(buf);
        return swap;
    }
    function encodeInteger(buf, pos, state, segment, j) {
        const next = segment[j];
        let num = next - state[j];
        state[j] = next;
        num = num < 0 ? (-num << 1) | 1 : num << 1;
        do {
            let clamped = num & 0b011111;
            num >>>= 5;
            if (num > 0)
                clamped |= 0b100000;
            buf[pos++] = intToChar[clamped];
        } while (num > 0);
        return pos;
    }

    // Matches the scheme of a URL, eg "http://"
    const schemeRegex = /^[\w+.-]+:\/\//;
    /**
     * Matches the parts of a URL:
     * 1. Scheme, including ":", guaranteed.
     * 2. User/password, including "@", optional.
     * 3. Host, guaranteed.
     * 4. Port, including ":", optional.
     * 5. Path, including "/", optional.
     */
    const urlRegex = /^([\w+.-]+:)\/\/([^@/#?]*@)?([^:/#?]*)(:\d+)?(\/[^#?]*)?/;
    /**
     * File URLs are weird. They dont' need the regular `//` in the scheme, they may or may not start
     * with a leading `/`, they can have a domain (but only if they don't start with a Windows drive).
     *
     * 1. Host, optional.
     * 2. Path, which may inclue "/", guaranteed.
     */
    const fileRegex = /^file:(?:\/\/((?![a-z]:)[^/]*)?)?(\/?.*)/i;
    function isAbsoluteUrl(input) {
        return schemeRegex.test(input);
    }
    function isSchemeRelativeUrl(input) {
        return input.startsWith('//');
    }
    function isAbsolutePath(input) {
        return input.startsWith('/');
    }
    function isFileUrl(input) {
        return input.startsWith('file:');
    }
    function parseAbsoluteUrl(input) {
        const match = urlRegex.exec(input);
        return makeUrl(match[1], match[2] || '', match[3], match[4] || '', match[5] || '/');
    }
    function parseFileUrl(input) {
        const match = fileRegex.exec(input);
        const path = match[2];
        return makeUrl('file:', '', match[1] || '', '', isAbsolutePath(path) ? path : '/' + path);
    }
    function makeUrl(scheme, user, host, port, path) {
        return {
            scheme,
            user,
            host,
            port,
            path,
            relativePath: false,
        };
    }
    function parseUrl(input) {
        if (isSchemeRelativeUrl(input)) {
            const url = parseAbsoluteUrl('http:' + input);
            url.scheme = '';
            return url;
        }
        if (isAbsolutePath(input)) {
            const url = parseAbsoluteUrl('http://foo.com' + input);
            url.scheme = '';
            url.host = '';
            return url;
        }
        if (isFileUrl(input))
            return parseFileUrl(input);
        if (isAbsoluteUrl(input))
            return parseAbsoluteUrl(input);
        const url = parseAbsoluteUrl('http://foo.com/' + input);
        url.scheme = '';
        url.host = '';
        url.relativePath = true;
        return url;
    }
    function stripPathFilename(path) {
        // If a path ends with a parent directory "..", then it's a relative path with excess parent
        // paths. It's not a file, so we can't strip it.
        if (path.endsWith('/..'))
            return path;
        const index = path.lastIndexOf('/');
        return path.slice(0, index + 1);
    }
    function mergePaths(url, base) {
        // If we're not a relative path, then we're an absolute path, and it doesn't matter what base is.
        if (!url.relativePath)
            return;
        normalizePath(base);
        // If the path is just a "/", then it was an empty path to begin with (remember, we're a relative
        // path).
        if (url.path === '/') {
            url.path = base.path;
        }
        else {
            // Resolution happens relative to the base path's directory, not the file.
            url.path = stripPathFilename(base.path) + url.path;
        }
        // If the base path is absolute, then our path is now absolute too.
        url.relativePath = base.relativePath;
    }
    /**
     * The path can have empty directories "//", unneeded parents "foo/..", or current directory
     * "foo/.". We need to normalize to a standard representation.
     */
    function normalizePath(url) {
        const { relativePath } = url;
        const pieces = url.path.split('/');
        // We need to preserve the first piece always, so that we output a leading slash. The item at
        // pieces[0] is an empty string.
        let pointer = 1;
        // Positive is the number of real directories we've output, used for popping a parent directory.
        // Eg, "foo/bar/.." will have a positive 2, and we can decrement to be left with just "foo".
        let positive = 0;
        // We need to keep a trailing slash if we encounter an empty directory (eg, splitting "foo/" will
        // generate `["foo", ""]` pieces). And, if we pop a parent directory. But once we encounter a
        // real directory, we won't need to append, unless the other conditions happen again.
        let addTrailingSlash = false;
        for (let i = 1; i < pieces.length; i++) {
            const piece = pieces[i];
            // An empty directory, could be a trailing slash, or just a double "//" in the path.
            if (!piece) {
                addTrailingSlash = true;
                continue;
            }
            // If we encounter a real directory, then we don't need to append anymore.
            addTrailingSlash = false;
            // A current directory, which we can always drop.
            if (piece === '.')
                continue;
            // A parent directory, we need to see if there are any real directories we can pop. Else, we
            // have an excess of parents, and we'll need to keep the "..".
            if (piece === '..') {
                if (positive) {
                    addTrailingSlash = true;
                    positive--;
                    pointer--;
                }
                else if (relativePath) {
                    // If we're in a relativePath, then we need to keep the excess parents. Else, in an absolute
                    // URL, protocol relative URL, or an absolute path, we don't need to keep excess.
                    pieces[pointer++] = piece;
                }
                continue;
            }
            // We've encountered a real directory. Move it to the next insertion pointer, which accounts for
            // any popped or dropped directories.
            pieces[pointer++] = piece;
            positive++;
        }
        let path = '';
        for (let i = 1; i < pointer; i++) {
            path += '/' + pieces[i];
        }
        if (!path || (addTrailingSlash && !path.endsWith('/..'))) {
            path += '/';
        }
        url.path = path;
    }
    /**
     * Attempts to resolve `input` URL/path relative to `base`.
     */
    function resolve$1(input, base) {
        if (!input && !base)
            return '';
        const url = parseUrl(input);
        // If we have a base, and the input isn't already an absolute URL, then we need to merge.
        if (base && !url.scheme) {
            const baseUrl = parseUrl(base);
            url.scheme = baseUrl.scheme;
            // If there's no host, then we were just a path.
            if (!url.host) {
                // The host, user, and port are joined, you can't copy one without the others.
                url.user = baseUrl.user;
                url.host = baseUrl.host;
                url.port = baseUrl.port;
            }
            mergePaths(url, baseUrl);
        }
        normalizePath(url);
        // If the input (and base, if there was one) are both relative, then we need to output a relative.
        if (url.relativePath) {
            // The first char is always a "/".
            const path = url.path.slice(1);
            if (!path)
                return '.';
            // If base started with a leading ".", or there is no base and input started with a ".", then we
            // need to ensure that the relative path starts with a ".". We don't know if relative starts
            // with a "..", though, so check before prepending.
            const keepRelative = (base || input).startsWith('.');
            return !keepRelative || path.startsWith('.') ? path : './' + path;
        }
        // If there's no host (and no scheme/user/port), then we need to output an absolute path.
        if (!url.scheme && !url.host)
            return url.path;
        // We're outputting either an absolute URL, or a protocol relative one.
        return `${url.scheme}//${url.user}${url.host}${url.port}${url.path}`;
    }

    function resolve(input, base) {
        // The base is always treated as a directory, if it's not empty.
        // https://github.com/mozilla/source-map/blob/8cb3ee57/lib/util.js#L327
        // https://github.com/chromium/chromium/blob/da4adbb3/third_party/blink/renderer/devtools/front_end/sdk/SourceMap.js#L400-L401
        if (base && !base.endsWith('/'))
            base += '/';
        return resolve$1(input, base);
    }

    /**
     * Removes everything after the last "/", but leaves the slash.
     */
    function stripFilename(path) {
        if (!path)
            return '';
        const index = path.lastIndexOf('/');
        return path.slice(0, index + 1);
    }

    const COLUMN$1 = 0;
    const SOURCES_INDEX$1 = 1;
    const SOURCE_LINE$1 = 2;
    const SOURCE_COLUMN$1 = 3;
    const NAMES_INDEX$1 = 4;

    function maybeSort(mappings, owned) {
        const unsortedIndex = nextUnsortedSegmentLine(mappings, 0);
        if (unsortedIndex === mappings.length)
            return mappings;
        // If we own the array (meaning we parsed it from JSON), then we're free to directly mutate it. If
        // not, we do not want to modify the consumer's input array.
        if (!owned)
            mappings = mappings.slice();
        for (let i = unsortedIndex; i < mappings.length; i = nextUnsortedSegmentLine(mappings, i + 1)) {
            mappings[i] = sortSegments(mappings[i], owned);
        }
        return mappings;
    }
    function nextUnsortedSegmentLine(mappings, start) {
        for (let i = start; i < mappings.length; i++) {
            if (!isSorted(mappings[i]))
                return i;
        }
        return mappings.length;
    }
    function isSorted(line) {
        for (let j = 1; j < line.length; j++) {
            if (line[j][COLUMN$1] < line[j - 1][COLUMN$1]) {
                return false;
            }
        }
        return true;
    }
    function sortSegments(line, owned) {
        if (!owned)
            line = line.slice();
        return line.sort(sortComparator);
    }
    function sortComparator(a, b) {
        return a[COLUMN$1] - b[COLUMN$1];
    }

    let found = false;
    /**
     * A binary search implementation that returns the index if a match is found.
     * If no match is found, then the left-index (the index associated with the item that comes just
     * before the desired index) is returned. To maintain proper sort order, a splice would happen at
     * the next index:
     *
     * ```js
     * const array = [1, 3];
     * const needle = 2;
     * const index = binarySearch(array, needle, (item, needle) => item - needle);
     *
     * assert.equal(index, 0);
     * array.splice(index + 1, 0, needle);
     * assert.deepEqual(array, [1, 2, 3]);
     * ```
     */
    function binarySearch(haystack, needle, low, high) {
        while (low <= high) {
            const mid = low + ((high - low) >> 1);
            const cmp = haystack[mid][COLUMN$1] - needle;
            if (cmp === 0) {
                found = true;
                return mid;
            }
            if (cmp < 0) {
                low = mid + 1;
            }
            else {
                high = mid - 1;
            }
        }
        found = false;
        return low - 1;
    }
    function upperBound(haystack, needle, index) {
        for (let i = index + 1; i < haystack.length; i++, index++) {
            if (haystack[i][COLUMN$1] !== needle)
                break;
        }
        return index;
    }
    function lowerBound(haystack, needle, index) {
        for (let i = index - 1; i >= 0; i--, index--) {
            if (haystack[i][COLUMN$1] !== needle)
                break;
        }
        return index;
    }
    function memoizedState() {
        return {
            lastKey: -1,
            lastNeedle: -1,
            lastIndex: -1,
        };
    }
    /**
     * This overly complicated beast is just to record the last tested line/column and the resulting
     * index, allowing us to skip a few tests if mappings are monotonically increasing.
     */
    function memoizedBinarySearch(haystack, needle, state, key) {
        const { lastKey, lastNeedle, lastIndex } = state;
        let low = 0;
        let high = haystack.length - 1;
        if (key === lastKey) {
            if (needle === lastNeedle) {
                found = lastIndex !== -1 && haystack[lastIndex][COLUMN$1] === needle;
                return lastIndex;
            }
            if (needle >= lastNeedle) {
                // lastIndex may be -1 if the previous needle was not found.
                low = lastIndex === -1 ? 0 : lastIndex;
            }
            else {
                high = lastIndex;
            }
        }
        state.lastKey = key;
        state.lastNeedle = needle;
        return (state.lastIndex = binarySearch(haystack, needle, low, high));
    }

    const AnyMap = function (map, mapUrl) {
        const parsed = typeof map === 'string' ? JSON.parse(map) : map;
        if (!('sections' in parsed))
            return new TraceMap(parsed, mapUrl);
        const mappings = [];
        const sources = [];
        const sourcesContent = [];
        const names = [];
        const { sections } = parsed;
        let i = 0;
        for (; i < sections.length - 1; i++) {
            const no = sections[i + 1].offset;
            addSection(sections[i], mapUrl, mappings, sources, sourcesContent, names, no.line, no.column);
        }
        if (sections.length > 0) {
            addSection(sections[i], mapUrl, mappings, sources, sourcesContent, names, Infinity, Infinity);
        }
        const joined = {
            version: 3,
            file: parsed.file,
            names,
            sources,
            sourcesContent,
            mappings,
        };
        return presortedDecodedMap(joined);
    };
    function addSection(section, mapUrl, mappings, sources, sourcesContent, names, stopLine, stopColumn) {
        const map = AnyMap(section.map, mapUrl);
        const { line: lineOffset, column: columnOffset } = section.offset;
        const sourcesOffset = sources.length;
        const namesOffset = names.length;
        const decoded = decodedMappings(map);
        const { resolvedSources } = map;
        append(sources, resolvedSources);
        append(sourcesContent, map.sourcesContent || fillSourcesContent(resolvedSources.length));
        append(names, map.names);
        // If this section jumps forwards several lines, we need to add lines to the output mappings catch up.
        for (let i = mappings.length; i <= lineOffset; i++)
            mappings.push([]);
        // We can only add so many lines before we step into the range that the next section's map
        // controls. When we get to the last line, then we'll start checking the segments to see if
        // they've crossed into the column range.
        const stopI = stopLine - lineOffset;
        const len = Math.min(decoded.length, stopI + 1);
        for (let i = 0; i < len; i++) {
            const line = decoded[i];
            // On the 0th loop, the line will already exist due to a previous section, or the line catch up
            // loop above.
            const out = i === 0 ? mappings[lineOffset] : (mappings[lineOffset + i] = []);
            // On the 0th loop, the section's column offset shifts us forward. On all other lines (since the
            // map can be multiple lines), it doesn't.
            const cOffset = i === 0 ? columnOffset : 0;
            for (let j = 0; j < line.length; j++) {
                const seg = line[j];
                const column = cOffset + seg[COLUMN$1];
                // If this segment steps into the column range that the next section's map controls, we need
                // to stop early.
                if (i === stopI && column >= stopColumn)
                    break;
                if (seg.length === 1) {
                    out.push([column]);
                    continue;
                }
                const sourcesIndex = sourcesOffset + seg[SOURCES_INDEX$1];
                const sourceLine = seg[SOURCE_LINE$1];
                const sourceColumn = seg[SOURCE_COLUMN$1];
                if (seg.length === 4) {
                    out.push([column, sourcesIndex, sourceLine, sourceColumn]);
                    continue;
                }
                out.push([column, sourcesIndex, sourceLine, sourceColumn, namesOffset + seg[NAMES_INDEX$1]]);
            }
        }
    }
    function append(arr, other) {
        for (let i = 0; i < other.length; i++)
            arr.push(other[i]);
    }
    // Sourcemaps don't need to have sourcesContent, and if they don't, we need to create an array of
    // equal length to the sources. This is because the sources and sourcesContent are paired arrays,
    // where `sourcesContent[i]` is the content of the `sources[i]` file. If we didn't, then joined
    // sourcemap would desynchronize the sources/contents.
    function fillSourcesContent(len) {
        const sourcesContent = [];
        for (let i = 0; i < len; i++)
            sourcesContent[i] = null;
        return sourcesContent;
    }

    const INVALID_ORIGINAL_MAPPING = Object.freeze({
        source: null,
        line: null,
        column: null,
        name: null,
    });
    Object.freeze({
        line: null,
        column: null,
    });
    const LINE_GTR_ZERO = '`line` must be greater than 0 (lines start at line 1)';
    const COL_GTR_EQ_ZERO = '`column` must be greater than or equal to 0 (columns start at column 0)';
    const LEAST_UPPER_BOUND = -1;
    const GREATEST_LOWER_BOUND = 1;
    /**
     * Returns the decoded (array of lines of segments) form of the SourceMap's mappings field.
     */
    let decodedMappings;
    /**
     * A higher-level API to find the source/line/column associated with a generated line/column
     * (think, from a stack trace). Line is 1-based, but column is 0-based, due to legacy behavior in
     * `source-map` library.
     */
    let originalPositionFor;
    /**
     * A helper that skips sorting of the input map's mappings array, which can be expensive for larger
     * maps.
     */
    let presortedDecodedMap;
    class TraceMap {
        constructor(map, mapUrl) {
            this._decodedMemo = memoizedState();
            this._bySources = undefined;
            this._bySourceMemos = undefined;
            const isString = typeof map === 'string';
            if (!isString && map.constructor === TraceMap)
                return map;
            const parsed = (isString ? JSON.parse(map) : map);
            const { version, file, names, sourceRoot, sources, sourcesContent } = parsed;
            this.version = version;
            this.file = file;
            this.names = names;
            this.sourceRoot = sourceRoot;
            this.sources = sources;
            this.sourcesContent = sourcesContent;
            if (sourceRoot || mapUrl) {
                const from = resolve(sourceRoot || '', stripFilename(mapUrl));
                this.resolvedSources = sources.map((s) => resolve(s || '', from));
            }
            else {
                this.resolvedSources = sources.map((s) => s || '');
            }
            const { mappings } = parsed;
            if (typeof mappings === 'string') {
                this._encoded = mappings;
                this._decoded = undefined;
            }
            else {
                this._encoded = undefined;
                this._decoded = maybeSort(mappings, isString);
            }
        }
    }
    (() => {
        decodedMappings = (map) => {
            return (map._decoded || (map._decoded = decode(map._encoded)));
        };
        originalPositionFor = (map, { line, column, bias }) => {
            line--;
            if (line < 0)
                throw new Error(LINE_GTR_ZERO);
            if (column < 0)
                throw new Error(COL_GTR_EQ_ZERO);
            const decoded = decodedMappings(map);
            // It's common for parent source maps to have pointers to lines that have no
            // mapping (like a "//# sourceMappingURL=") at the end of the child file.
            if (line >= decoded.length)
                return INVALID_ORIGINAL_MAPPING;
            const segment = traceSegmentInternal(decoded[line], map._decodedMemo, line, column, bias || GREATEST_LOWER_BOUND);
            if (segment == null)
                return INVALID_ORIGINAL_MAPPING;
            if (segment.length == 1)
                return INVALID_ORIGINAL_MAPPING;
            const { names, resolvedSources } = map;
            return {
                source: resolvedSources[segment[SOURCES_INDEX$1]],
                line: segment[SOURCE_LINE$1] + 1,
                column: segment[SOURCE_COLUMN$1],
                name: segment.length === 5 ? names[segment[NAMES_INDEX$1]] : null,
            };
        };
        presortedDecodedMap = (map, mapUrl) => {
            const clone = Object.assign({}, map);
            clone.mappings = [];
            const tracer = new TraceMap(clone, mapUrl);
            tracer._decoded = map.mappings;
            return tracer;
        };
    })();
    function traceSegmentInternal(segments, memo, line, column, bias) {
        let index = memoizedBinarySearch(segments, column, memo, line);
        if (found) {
            index = (bias === LEAST_UPPER_BOUND ? upperBound : lowerBound)(segments, column, index);
        }
        else if (bias === LEAST_UPPER_BOUND)
            index++;
        if (index === -1 || index === segments.length)
            return null;
        return segments[index];
    }

    /**
     * Gets the index associated with `key` in the backing array, if it is already present.
     */
    let get;
    /**
     * Puts `key` into the backing array, if it is not already present. Returns
     * the index of the `key` in the backing array.
     */
    let put;
    /**
     * SetArray acts like a `Set` (allowing only one occurrence of a string `key`), but provides the
     * index of the `key` in the backing array.
     *
     * This is designed to allow synchronizing a second array with the contents of the backing array,
     * like how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`,
     * and there are never duplicates.
     */
    class SetArray {
        constructor() {
            this._indexes = { __proto__: null };
            this.array = [];
        }
    }
    (() => {
        get = (strarr, key) => strarr._indexes[key];
        put = (strarr, key) => {
            // The key may or may not be present. If it is present, it's a number.
            const index = get(strarr, key);
            if (index !== undefined)
                return index;
            const { array, _indexes: indexes } = strarr;
            return (indexes[key] = array.push(key) - 1);
        };
    })();

    const COLUMN = 0;
    const SOURCES_INDEX = 1;
    const SOURCE_LINE = 2;
    const SOURCE_COLUMN = 3;
    const NAMES_INDEX = 4;

    const NO_NAME = -1;
    /**
     * Same as `addMapping`, but will only add the mapping if it generates useful information in the
     * resulting map. This only works correctly if mappings are added **in order**, meaning you should
     * not add a mapping with a lower generated line/column than one that came before.
     */
    let maybeAddMapping;
    /**
     * Adds/removes the content of the source file to the source map.
     */
    let setSourceContent;
    /**
     * Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
     * a sourcemap, or to JSON.stringify.
     */
    let toDecodedMap;
    /**
     * Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
     * a sourcemap, or to JSON.stringify.
     */
    let toEncodedMap;
    // This split declaration is only so that terser can elminiate the static initialization block.
    let addSegmentInternal;
    /**
     * Provides the state to generate a sourcemap.
     */
    class GenMapping {
        constructor({ file, sourceRoot } = {}) {
            this._names = new SetArray();
            this._sources = new SetArray();
            this._sourcesContent = [];
            this._mappings = [];
            this.file = file;
            this.sourceRoot = sourceRoot;
        }
    }
    (() => {
        maybeAddMapping = (map, mapping) => {
            return addMappingInternal(true, map, mapping);
        };
        setSourceContent = (map, source, content) => {
            const { _sources: sources, _sourcesContent: sourcesContent } = map;
            sourcesContent[put(sources, source)] = content;
        };
        toDecodedMap = (map) => {
            const { file, sourceRoot, _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
            removeEmptyFinalLines(mappings);
            return {
                version: 3,
                file: file || undefined,
                names: names.array,
                sourceRoot: sourceRoot || undefined,
                sources: sources.array,
                sourcesContent,
                mappings,
            };
        };
        toEncodedMap = (map) => {
            const decoded = toDecodedMap(map);
            return Object.assign(Object.assign({}, decoded), { mappings: encode(decoded.mappings) });
        };
        // Internal helpers
        addSegmentInternal = (skipable, map, genLine, genColumn, source, sourceLine, sourceColumn, name) => {
            const { _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
            const line = getLine(mappings, genLine);
            const index = getColumnIndex(line, genColumn);
            if (!source) {
                if (skipable && skipSourceless(line, index))
                    return;
                return insert(line, index, [genColumn]);
            }
            const sourcesIndex = put(sources, source);
            const namesIndex = name ? put(names, name) : NO_NAME;
            if (sourcesIndex === sourcesContent.length)
                sourcesContent[sourcesIndex] = null;
            if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
                return;
            }
            return insert(line, index, name
                ? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
                : [genColumn, sourcesIndex, sourceLine, sourceColumn]);
        };
    })();
    function getLine(mappings, index) {
        for (let i = mappings.length; i <= index; i++) {
            mappings[i] = [];
        }
        return mappings[index];
    }
    function getColumnIndex(line, genColumn) {
        let index = line.length;
        for (let i = index - 1; i >= 0; index = i--) {
            const current = line[i];
            if (genColumn >= current[COLUMN])
                break;
        }
        return index;
    }
    function insert(array, index, value) {
        for (let i = array.length; i > index; i--) {
            array[i] = array[i - 1];
        }
        array[index] = value;
    }
    function removeEmptyFinalLines(mappings) {
        const { length } = mappings;
        let len = length;
        for (let i = len - 1; i >= 0; len = i, i--) {
            if (mappings[i].length > 0)
                break;
        }
        if (len < length)
            mappings.length = len;
    }
    function skipSourceless(line, index) {
        // The start of a line is already sourceless, so adding a sourceless segment to the beginning
        // doesn't generate any useful information.
        if (index === 0)
            return true;
        const prev = line[index - 1];
        // If the previous segment is also sourceless, then adding another sourceless segment doesn't
        // genrate any new information. Else, this segment will end the source/named segment and point to
        // a sourceless position, which is useful.
        return prev.length === 1;
    }
    function skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex) {
        // A source/named segment at the start of a line gives position at that genColumn
        if (index === 0)
            return false;
        const prev = line[index - 1];
        // If the previous segment is sourceless, then we're transitioning to a source.
        if (prev.length === 1)
            return false;
        // If the previous segment maps to the exact same source position, then this segment doesn't
        // provide any new position information.
        return (sourcesIndex === prev[SOURCES_INDEX] &&
            sourceLine === prev[SOURCE_LINE] &&
            sourceColumn === prev[SOURCE_COLUMN] &&
            namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME));
    }
    function addMappingInternal(skipable, map, mapping) {
        const { generated, source, original, name } = mapping;
        if (!source) {
            return addSegmentInternal(skipable, map, generated.line - 1, generated.column, null, null, null, null);
        }
        const s = source;
        return addSegmentInternal(skipable, map, generated.line - 1, generated.column, s, original.line - 1, original.column, name);
    }

    class SourceMapConsumer {
        constructor(map, mapUrl) {
            const trace = (this._map = new AnyMap(map, mapUrl));
            this.file = trace.file;
            this.names = trace.names;
            this.sourceRoot = trace.sourceRoot;
            this.sources = trace.resolvedSources;
            this.sourcesContent = trace.sourcesContent;
        }
        originalPositionFor(needle) {
            return originalPositionFor(this._map, needle);
        }
        destroy() {
            // noop.
        }
    }
    class SourceMapGenerator {
        constructor(opts) {
            this._map = new GenMapping(opts);
        }
        addMapping(mapping) {
            maybeAddMapping(this._map, mapping);
        }
        setSourceContent(source, content) {
            setSourceContent(this._map, source, content);
        }
        toJSON() {
            return toEncodedMap(this._map);
        }
        toDecodedMap() {
            return toDecodedMap(this._map);
        }
    }

    exports.SourceMapConsumer = SourceMapConsumer;
    exports.SourceMapGenerator = SourceMapGenerator;

    Object.defineProperty(exports, '__esModule', { value: true });

}));
//# sourceMappingURL=source-map.umd.js.map

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