forked from TrySound/rollup-plugin-terser
/
index.js
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/
index.js
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const { codeFrameColumns } = require("@babel/code-frame");
const Worker = require("jest-worker").default;
const serialize = require("serialize-javascript");
const { createFilter } = require('rollup-pluginutils');
function terser(userOptions = {}) {
if (userOptions.sourceMap != null) {
throw Error("sourceMap option is removed, use sourcemap instead");
}
const filter = createFilter( userOptions.include, userOptions.exclude, { resolve: false } );
return {
name: "terser",
renderChunk(code, chunk, outputOptions) {
if(!filter(chunk.fileName)){
return null;
}
if (!this.worker) {
this.worker = new Worker(require.resolve("./transform.js"), {
numWorkers: userOptions.numWorkers
});
this.numOfBundles = 0;
}
this.numOfBundles++;
// TODO rewrite with object spread after node6 drop
const normalizedOptions = Object.assign({}, userOptions, {
sourceMap: userOptions.sourcemap !== false,
module: outputOptions.format === "es" || outputOptions.format === "esm"
});
for (let key of ["include", "exclude", "sourcemap", "numWorkers"]) {
if (normalizedOptions.hasOwnProperty(key)) {
delete normalizedOptions[key];
}
}
const serializedOptions = serialize(normalizedOptions);
const result = this.worker
.transform(code, serializedOptions)
.catch(error => {
const { message, line, col: column } = error;
console.error(
codeFrameColumns(code, { start: { line, column } }, { message })
);
throw error;
});
const handler = () => {
this.numOfBundles--;
if (this.numOfBundles === 0) {
this.worker.end();
this.worker = 0;
}
};
result.then(handler, handler);
return result;
}
};
}
exports.terser = terser;