110 lines
3.0 KiB
JavaScript
110 lines
3.0 KiB
JavaScript
const { codeFrameColumns } = require("@babel/code-frame");
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const Worker = require("jest-worker").default;
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const serialize = require("serialize-javascript");
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const { createFilter } = require("rollup-pluginutils");
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function terser(userOptions = {}) {
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if (userOptions.sourceMap != null) {
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throw Error("sourceMap option is removed, use sourcemap instead");
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}
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const filter = createFilter(userOptions.include, userOptions.exclude, {
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resolve: false
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});
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return {
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name: "terser",
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renderChunk(code, chunk, outputOptions) {
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if (!filter(chunk.fileName)) {
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return null;
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}
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if (!this.worker) {
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this.worker = new Worker(require.resolve("./transform.js"), {
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numWorkers: userOptions.numWorkers
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});
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this.numOfBundles = 0;
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}
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this.numOfBundles++;
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const defaultOptions = {
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sourceMap: userOptions.sourcemap !== false
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};
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if (outputOptions.format === "es" || outputOptions.format === "esm") {
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defaultOptions.module = true;
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}
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if (outputOptions.format === "cjs") {
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defaultOptions.toplevel = true;
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}
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// TODO rewrite with object spread after dropping node v6
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const normalizedOptions = Object.assign({}, defaultOptions, userOptions);
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// remove plugin specific options
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for (let key of ["include", "exclude", "sourcemap", "numWorkers"]) {
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if (normalizedOptions.hasOwnProperty(key)) {
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delete normalizedOptions[key];
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}
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}
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const serializedOptions = serialize(normalizedOptions);
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const result = this.worker
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.transform(code, serializedOptions)
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.catch(error => {
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const { message, line, col: column } = error;
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console.error(
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codeFrameColumns(code, { start: { line, column } }, { message })
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);
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throw error;
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});
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const handler = () => {
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this.numOfBundles--;
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if (this.numOfBundles === 0) {
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this.worker.end();
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this.worker = 0;
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}
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};
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result.then(handler, handler);
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return result.then(result => {
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if (result.nameCache) {
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let { vars, props } = userOptions.nameCache;
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// only assign nameCache.vars if it was provided, and if terser produced values:
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if (vars) {
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const newVars =
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result.nameCache.vars && result.nameCache.vars.props;
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if (newVars) {
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vars.props = vars.props || {};
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Object.assign(vars.props, newVars);
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}
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}
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// support populating an empty nameCache object:
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if (!props) {
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props = userOptions.nameCache.props = {};
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}
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// merge updated props into original nameCache object:
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const newProps =
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result.nameCache.props && result.nameCache.props.props;
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if (newProps) {
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props.props = props.props || {};
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Object.assign(props.props, newProps);
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}
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}
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return result.result;
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});
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}
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};
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}
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exports.terser = terser;
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