hexo/node_modules/rollup-plugin-terser/rollup-plugin-terser.js

103 lines
2.9 KiB
JavaScript

const { codeFrameColumns } = require("@babel/code-frame");
const Worker = require("jest-worker").default;
const serialize = require("serialize-javascript");
function terser(userOptions = {}) {
if (userOptions.sourceMap != null) {
throw Error(
"sourceMap option is removed. Now it is inferred from rollup options."
);
}
if (userOptions.sourcemap != null) {
throw Error(
"sourcemap option is removed. Now it is inferred from rollup options."
);
}
return {
name: "terser",
async renderChunk(code, chunk, outputOptions) {
if (!this.worker) {
this.worker = new Worker(require.resolve("./transform.js"), {
numWorkers: userOptions.numWorkers,
});
this.numOfBundles = 0;
}
this.numOfBundles++;
const defaultOptions = {
sourceMap:
outputOptions.sourcemap === true ||
typeof outputOptions.sourcemap === "string",
};
if (outputOptions.format === "es" || outputOptions.format === "esm") {
defaultOptions.module = true;
}
if (outputOptions.format === "cjs") {
defaultOptions.toplevel = true;
}
const normalizedOptions = { ...defaultOptions, ...userOptions };
// remove plugin specific options
for (let key of ["numWorkers"]) {
if (normalizedOptions.hasOwnProperty(key)) {
delete normalizedOptions[key];
}
}
const serializedOptions = serialize(normalizedOptions);
try {
const result = await this.worker.transform(code, serializedOptions);
if (result.nameCache) {
let { vars, props } = userOptions.nameCache;
// only assign nameCache.vars if it was provided, and if terser produced values:
if (vars) {
const newVars =
result.nameCache.vars && result.nameCache.vars.props;
if (newVars) {
vars.props = vars.props || {};
Object.assign(vars.props, newVars);
}
}
// support populating an empty nameCache object:
if (!props) {
props = userOptions.nameCache.props = {};
}
// merge updated props into original nameCache object:
const newProps =
result.nameCache.props && result.nameCache.props.props;
if (newProps) {
props.props = props.props || {};
Object.assign(props.props, newProps);
}
}
return result.result;
} catch (error) {
const { message, line, col: column } = error;
console.error(
codeFrameColumns(code, { start: { line, column } }, { message })
);
throw error;
} finally {
this.numOfBundles--;
if (this.numOfBundles === 0) {
this.worker.end();
this.worker = 0;
}
}
},
};
}
exports.terser = terser;