Method populateSourceMap

modules/internal/loader.js:137–167

* Populates the source map registry of a given module * Extracts the source map URL from the given code, parses the source map and build the SourceMapConsumer * This function will fail gracefully and not throw * * @param {string} text The JS code of the module * @param {stri

(text, uri, absoluteUri)

     *   sourceMappingURL definition. This is only used for non-module files.
     */
    populateSourceMap(text, uri, absoluteUri) {
        if (!text)
            return;
        const sourceMapUrl = extractUrl(text);
        if (!sourceMapUrl)
            return;

        let jsonText = null;
        try {
            // check if we have an inlined data uri
            if (sourceMapUrl?.startsWith(DATA_URI_PREFIX)) {
                jsonText = atob(sourceMapUrl.substring(DATA_URI_PREFIX.length));
            } else {
                // load the source map resource or file
                // resolve the source map file relative to the source file
                const sourceMapUri = resolveRelativeResourceOrFile(absoluteUri ?? uri,
                    `./${sourceMapUrl}`);
                jsonText = this.loadURI(sourceMapUri);
            }
        } catch {}

        if (jsonText) {
            try {
                const sourceMapRegistry = getSourceMapRegistry(this.global);
                const sourceMap = JSON.parse(jsonText);
                const consumer = new SourceMapConsumer(sourceMap);

                sourceMapRegistry.set(uri, consumer);
            } catch {}
        }
    }

    /**
     * Resolves a module import with optional handling for relative imports.