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+(function (global, factory) {
+ typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('@jridgewell/trace-mapping'), require('@jridgewell/gen-mapping')) :
+ typeof define === 'function' && define.amd ? define(['@jridgewell/trace-mapping', '@jridgewell/gen-mapping'], factory) :
+ (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.remapping = factory(global.traceMapping, global.genMapping));
+})(this, (function (traceMapping, genMapping) { 'use strict';
+
+ const SOURCELESS_MAPPING = /* #__PURE__ */ SegmentObject('', -1, -1, '', null);
+ const EMPTY_SOURCES = [];
+ function SegmentObject(source, line, column, name, content) {
+ return { source, line, column, name, content };
+ }
+ function Source(map, sources, source, content) {
+ return {
+ map,
+ sources,
+ source,
+ content,
+ };
+ }
+ /**
+ * MapSource represents a single sourcemap, with the ability to trace mappings into its child nodes
+ * (which may themselves be SourceMapTrees).
+ */
+ function MapSource(map, sources) {
+ return Source(map, sources, '', null);
+ }
+ /**
+ * A "leaf" node in the sourcemap tree, representing an original, unmodified source file. Recursive
+ * segment tracing ends at the `OriginalSource`.
+ */
+ function OriginalSource(source, content) {
+ return Source(null, EMPTY_SOURCES, source, content);
+ }
+ /**
+ * traceMappings is only called on the root level SourceMapTree, and begins the process of
+ * resolving each mapping in terms of the original source files.
+ */
+ function traceMappings(tree) {
+ // TODO: Eventually support sourceRoot, which has to be removed because the sources are already
+ // fully resolved. We'll need to make sources relative to the sourceRoot before adding them.
+ const gen = new genMapping.GenMapping({ file: tree.map.file });
+ const { sources: rootSources, map } = tree;
+ const rootNames = map.names;
+ const rootMappings = traceMapping.decodedMappings(map);
+ for (let i = 0; i < rootMappings.length; i++) {
+ const segments = rootMappings[i];
+ for (let j = 0; j < segments.length; j++) {
+ const segment = segments[j];
+ const genCol = segment[0];
+ let traced = SOURCELESS_MAPPING;
+ // 1-length segments only move the current generated column, there's no source information
+ // to gather from it.
+ if (segment.length !== 1) {
+ const source = rootSources[segment[1]];
+ traced = originalPositionFor(source, segment[2], segment[3], segment.length === 5 ? rootNames[segment[4]] : '');
+ // If the trace is invalid, then the trace ran into a sourcemap that doesn't contain a
+ // respective segment into an original source.
+ if (traced == null)
+ continue;
+ }
+ const { column, line, name, content, source } = traced;
+ genMapping.maybeAddSegment(gen, i, genCol, source, line, column, name);
+ if (source && content != null)
+ genMapping.setSourceContent(gen, source, content);
+ }
+ }
+ return gen;
+ }
+ /**
+ * originalPositionFor is only called on children SourceMapTrees. It recurses down into its own
+ * child SourceMapTrees, until we find the original source map.
+ */
+ function originalPositionFor(source, line, column, name) {
+ if (!source.map) {
+ return SegmentObject(source.source, line, column, name, source.content);
+ }
+ const segment = traceMapping.traceSegment(source.map, line, column);
+ // If we couldn't find a segment, then this doesn't exist in the sourcemap.
+ if (segment == null)
+ return null;
+ // 1-length segments only move the current generated column, there's no source information
+ // to gather from it.
+ if (segment.length === 1)
+ return SOURCELESS_MAPPING;
+ return originalPositionFor(source.sources[segment[1]], segment[2], segment[3], segment.length === 5 ? source.map.names[segment[4]] : name);
+ }
+
+ function asArray(value) {
+ if (Array.isArray(value))
+ return value;
+ return [value];
+ }
+ /**
+ * Recursively builds a tree structure out of sourcemap files, with each node
+ * being either an `OriginalSource` "leaf" or a `SourceMapTree` composed of
+ * `OriginalSource`s and `SourceMapTree`s.
+ *
+ * Every sourcemap is composed of a collection of source files and mappings
+ * into locations of those source files. When we generate a `SourceMapTree` for
+ * the sourcemap, we attempt to load each source file's own sourcemap. If it
+ * does not have an associated sourcemap, it is considered an original,
+ * unmodified source file.
+ */
+ function buildSourceMapTree(input, loader) {
+ const maps = asArray(input).map((m) => new traceMapping.TraceMap(m, ''));
+ const map = maps.pop();
+ for (let i = 0; i < maps.length; i++) {
+ if (maps[i].sources.length > 1) {
+ throw new Error(`Transformation map ${i} must have exactly one source file.\n` +
+ 'Did you specify these with the most recent transformation maps first?');
+ }
+ }
+ let tree = build(map, loader, '', 0);
+ for (let i = maps.length - 1; i >= 0; i--) {
+ tree = MapSource(maps[i], [tree]);
+ }
+ return tree;
+ }
+ function build(map, loader, importer, importerDepth) {
+ const { resolvedSources, sourcesContent } = map;
+ const depth = importerDepth + 1;
+ const children = resolvedSources.map((sourceFile, i) => {
+ // The loading context gives the loader more information about why this file is being loaded
+ // (eg, from which importer). It also allows the loader to override the location of the loaded
+ // sourcemap/original source, or to override the content in the sourcesContent field if it's
+ // an unmodified source file.
+ const ctx = {
+ importer,
+ depth,
+ source: sourceFile || '',
+ content: undefined,
+ };
+ // Use the provided loader callback to retrieve the file's sourcemap.
+ // TODO: We should eventually support async loading of sourcemap files.
+ const sourceMap = loader(ctx.source, ctx);
+ const { source, content } = ctx;
+ // If there is a sourcemap, then we need to recurse into it to load its source files.
+ if (sourceMap)
+ return build(new traceMapping.TraceMap(sourceMap, source), loader, source, depth);
+ // Else, it's an an unmodified source file.
+ // The contents of this unmodified source file can be overridden via the loader context,
+ // allowing it to be explicitly null or a string. If it remains undefined, we fall back to
+ // the importing sourcemap's `sourcesContent` field.
+ const sourceContent = content !== undefined ? content : sourcesContent ? sourcesContent[i] : null;
+ return OriginalSource(source, sourceContent);
+ });
+ return MapSource(map, children);
+ }
+
+ /**
+ * A SourceMap v3 compatible sourcemap, which only includes fields that were
+ * provided to it.
+ */
+ class SourceMap {
+ constructor(map, options) {
+ const out = options.decodedMappings ? genMapping.toDecodedMap(map) : genMapping.toEncodedMap(map);
+ this.version = out.version; // SourceMap spec says this should be first.
+ this.file = out.file;
+ this.mappings = out.mappings;
+ this.names = out.names;
+ this.sourceRoot = out.sourceRoot;
+ this.sources = out.sources;
+ if (!options.excludeContent) {
+ this.sourcesContent = out.sourcesContent;
+ }
+ }
+ toString() {
+ return JSON.stringify(this);
+ }
+ }
+
+ /**
+ * Traces through all the mappings in the root sourcemap, through the sources
+ * (and their sourcemaps), all the way back to the original source location.
+ *
+ * `loader` will be called every time we encounter a source file. If it returns
+ * a sourcemap, we will recurse into that sourcemap to continue the trace. If
+ * it returns a falsey value, that source file is treated as an original,
+ * unmodified source file.
+ *
+ * Pass `excludeContent` to exclude any self-containing source file content
+ * from the output sourcemap.
+ *
+ * Pass `decodedMappings` to receive a SourceMap with decoded (instead of
+ * VLQ encoded) mappings.
+ */
+ function remapping(input, loader, options) {
+ const opts = typeof options === 'object' ? options : { excludeContent: !!options, decodedMappings: false };
+ const tree = buildSourceMapTree(input, loader);
+ return new SourceMap(traceMappings(tree), opts);
+ }
+
+ return remapping;
+
+}));
+//# sourceMappingURL=remapping.umd.js.map