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Merge pull request #335 from developit/compressor-options

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Add compressor options
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Jason Miller 2019-03-04 18:30:25 -05:00 committed by GitHub
commit f6ebebb1f8
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1 changed files with 51 additions and 18 deletions
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69
src/index.js
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@ -44,6 +44,31 @@ const toTerserLiteral = (value, name) => {
// default: behaviour from Terser (@prefix=1 produces expression/literal, unprefixed=1 produces string literal):
};
// Normalize Terser options from microbundle's relaxed JSON format (mutates argument in-place)
function normalizeMinifyOptions(minifyOptions) {
const mangle = minifyOptions.mangle || (minifyOptions.mangle = {});
let properties = mangle.properties;
// allow top-level "properties" key to override mangle.properties (including {properties:false}):
if (minifyOptions.properties != null) {
properties = mangle.properties =
minifyOptions.properties &&
Object.assign(properties, minifyOptions.properties);
}
// allow previous format ({ mangle:{regex:'^_',reserved:[]} }):
if (minifyOptions.regex || minifyOptions.reserved) {
if (!properties) properties = mangle.properties = {};
properties.regex = properties.regex || minifyOptions.regex;
properties.reserved = properties.reserved || minifyOptions.reserved;
}
if (properties) {
if (properties.regex) properties.regex = new RegExp(properties.regex);
properties.reserved = [].concat(properties.reserved || []);
}
}
// Parses values of the form "$=jQuery,React=react" into key-value object pairs.
const parseMappingArgument = (globalStrings, processValue) => {
const globals = {};
@ -387,7 +412,9 @@ function createConfig(options, entry, format, writeMeta) {
// let rollupName = safeVariableName(basename(entry).replace(/\.js$/, ''));
let nameCache = {};
let mangleOptions = options.pkg.mangle || false;
const bareNameCache = nameCache;
// Support "minify" field and legacy "mangle" field via package.json:
let minifyOptions = options.pkg.minify || options.pkg.mangle || {};
const useTypescript = extname(entry) === '.ts' || extname(entry) === '.tsx';
@ -400,10 +427,22 @@ function createConfig(options, entry, format, writeMeta) {
nameCache = JSON.parse(
fs.readFileSync(resolve(options.cwd, 'mangle.json'), 'utf8'),
);
// mangle.json can contain a "minify" field, same format as the pkg.mangle:
if (nameCache.minify) {
minifyOptions = Object.assign(
{},
minifyOptions || {},
nameCache.minify,
);
}
} catch (e) {}
}
loadNameCache();
normalizeMinifyOptions(minifyOptions);
if (nameCache === bareNameCache) nameCache = null;
let shebang;
let config = {
@ -539,28 +578,22 @@ function createConfig(options, entry, format, writeMeta) {
terser({
sourcemap: true,
output: { comments: false },
compress: {
keep_infinity: true,
pure_getters: true,
global_defs: defines,
passes: 10,
},
compress: Object.assign(
{
keep_infinity: true,
pure_getters: true,
global_defs: defines,
passes: 10,
},
minifyOptions.compress || {},
),
warnings: true,
ecma: 5,
toplevel: format === 'cjs' || format === 'es',
mangle: {
properties: mangleOptions
? {
regex: mangleOptions.regex
? new RegExp(mangleOptions.regex)
: null,
reserved: mangleOptions.reserved || [],
}
: false,
},
mangle: Object.assign({}, minifyOptions.mangle || {}),
nameCache,
}),
mangleOptions && {
nameCache && {
// before hook
options: loadNameCache,
// after hook