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node_modules/webpack-sources/lib/helpers/streamAndGetSourceAndMap.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const createMappingsSerializer = require("./createMappingsSerializer");
+const streamChunks = require("./streamChunks");
+
+/** @typedef {import("../Source").RawSourceMap} RawSourceMap */
+/** @typedef {import("./streamChunks").GeneratedSourceInfo} GeneratedSourceInfo */
+/** @typedef {import("./streamChunks").OnChunk} OnChunk */
+/** @typedef {import("./streamChunks").OnName} OnName */
+/** @typedef {import("./streamChunks").OnSource} OnSource */
+/** @typedef {import("./streamChunks").Options} Options */
+/** @typedef {import("./streamChunks").SourceMaybeWithStreamChunksFunction} SourceMaybeWithStreamChunksFunction */
+
+/**
+ * @param {SourceMaybeWithStreamChunksFunction} inputSource input source
+ * @param {Options} options options
+ * @param {OnChunk} onChunk on chunk
+ * @param {OnSource} onSource on source
+ * @param {OnName} onName on name
+ * @returns {{ result: GeneratedSourceInfo, source: string, map: RawSourceMap | null }} result
+ */
+const streamAndGetSourceAndMap = (
+	inputSource,
+	options,
+	onChunk,
+	onSource,
+	onName,
+) => {
+	let code = "";
+	let mappings = "";
+	/** @type {(string | null)[]} */
+	const potentialSources = [];
+	/** @type {(string | null)[]} */
+	const potentialSourcesContent = [];
+	/** @type {(string | null)[]} */
+	const potentialNames = [];
+	const addMapping = createMappingsSerializer({ ...options, columns: true });
+	const finalSource = Boolean(options && options.finalSource);
+	const { generatedLine, generatedColumn, source } = streamChunks(
+		inputSource,
+		options,
+		(
+			chunk,
+			generatedLine,
+			generatedColumn,
+			sourceIndex,
+			originalLine,
+			originalColumn,
+			nameIndex,
+		) => {
+			if (chunk !== undefined) code += chunk;
+			mappings += addMapping(
+				generatedLine,
+				generatedColumn,
+				sourceIndex,
+				originalLine,
+				originalColumn,
+				nameIndex,
+			);
+			return onChunk(
+				finalSource ? undefined : chunk,
+				generatedLine,
+				generatedColumn,
+				sourceIndex,
+				originalLine,
+				originalColumn,
+				nameIndex,
+			);
+		},
+		(sourceIndex, source, sourceContent) => {
+			while (potentialSources.length < sourceIndex) {
+				potentialSources.push(null);
+			}
+			potentialSources[sourceIndex] = source;
+			if (sourceContent !== undefined) {
+				while (potentialSourcesContent.length < sourceIndex) {
+					potentialSourcesContent.push(null);
+				}
+				potentialSourcesContent[sourceIndex] = sourceContent;
+			}
+			return onSource(sourceIndex, source, sourceContent);
+		},
+		(nameIndex, name) => {
+			while (potentialNames.length < nameIndex) {
+				potentialNames.push(null);
+			}
+			potentialNames[nameIndex] = name;
+			return onName(nameIndex, name);
+		},
+	);
+	const resultSource = source !== undefined ? source : code;
+
+	return {
+		result: {
+			generatedLine,
+			generatedColumn,
+			source: finalSource ? resultSource : undefined,
+		},
+		source: resultSource,
+		map:
+			mappings.length > 0
+				? {
+						version: 3,
+						file: "x",
+						mappings,
+						// We handle broken sources as `null`, in spec this field should be string, but no information what we should do in such cases if we change type it will be breaking change
+						sources: /** @type {string[]} */ (potentialSources),
+						sourcesContent:
+							potentialSourcesContent.length > 0
+								? /** @type {string[]} */ (potentialSourcesContent)
+								: undefined,
+						names: /** @type {string[]} */ (potentialNames),
+					}
+				: null,
+	};
+};
+
+module.exports = streamAndGetSourceAndMap;