babel-plugin-transform-imports-api
Version:
Convert import default package API to modular reference to reduce package size and transforms member style imports.
113 lines • 5.17 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
/** forked by https://bitbucket.org/amctheatres/babel-transform-imports/src/master/index.js */
const isInvalidPath = require("is-invalid-path");
const pathLib = require("path");
// 更改插件 state.opts 为 babel-transform-imports 插件的 state.opts
const proxyOptKey = 'packagesImport';
function findOptionFromSource(source, state) {
var opts = state.opts[proxyOptKey];
if (opts[source])
return source;
var opt = Object.keys(opts).find(function (key) {
return isInvalidPath(key) && new RegExp(key).test(source);
});
if (opt)
return opt;
var isRelativePath = source.match(/^\.{0,2}\//);
// This block handles relative paths, such as ./components, ../../components, etc.
if (isRelativePath) {
var dirname = source[0] === '/' ? '' : state.file.opts.filename ? pathLib.dirname(state.file.opts.filename) : '.';
var _source = pathLib.resolve(pathLib.join(dirname, source));
if (opts[_source]) {
return _source;
}
}
}
function getMatchesFromSource(opt, source) {
var regex = new RegExp(opt, 'g');
var matches = [];
var m;
while ((m = regex.exec(source)) !== null) {
if (m.index === regex.lastIndex)
regex.lastIndex++;
m.forEach(function (match) {
// @ts-ignore
matches.push(match);
});
}
return matches;
}
function barf(msg) {
throw new Error('babel-plugin-transform-imports: ' + msg);
}
function transform(transformOption, importName, matches) {
if (typeof transformOption === 'function') {
return transformOption(importName, matches);
}
return transformOption.replace(/\$\{\s?([\w\d]*)\s?\}/ig, function (str, g1) {
if (g1 === 'member')
return importName;
return matches[g1];
});
}
function transformImport(path, state, types) {
// https://github.com/babel/babel/tree/master/packages/babel-types#timportdeclarationspecifiers-source
// path.node has properties 'source' and 'specifiers' attached.
// path.node.source is the library/module name, aka 'react-bootstrap'.
// path.node.specifiers is an array of ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier
var source = path.node.source.value;
var opt = findOptionFromSource(source, state);
var isRegexp = opt && isInvalidPath(opt);
var opts = state.opts[proxyOptKey][opt];
var hasOpts = !!opts;
if (hasOpts) {
if (!opts.transform) {
barf('transform option is required for module ' + source);
}
var transforms = [];
var fullImports = path.node.specifiers.filter(function (specifier) { return specifier.type !== 'ImportSpecifier'; });
var memberImports = path.node.specifiers.filter(function (specifier) { return specifier.type === 'ImportSpecifier'; });
if (fullImports.length > 0) {
// Examples of "full" imports:
// import * as name from 'module'; (ImportNamespaceSpecifier)
// import name from 'module'; (ImportDefaultSpecifier)
if (opts.preventFullImport) {
barf('import of entire module ' + source + ' not allowed due to preventFullImport setting');
}
if (memberImports.length > 0) {
// Swap out the import with one that doesn't include member imports. Member imports should each get their own import line
// transform this:
// import Bootstrap, { Grid } from 'react-bootstrap';
// into this:
// import Bootstrap from 'react-bootstrap';
// @ts-ignore
transforms.push(types.importDeclaration(fullImports, types.stringLiteral(source)));
}
}
var matches = isRegexp ? getMatchesFromSource(opt, source) : [];
memberImports.forEach(function (memberImport) {
// Examples of member imports:
// import { member } from 'module'; (ImportSpecifier)
// import { member as alias } from 'module' (ImportSpecifier)
// transform this:
// import { Grid as gird } from 'react-bootstrap';
// into this:
// import gird from 'react-bootstrap/lib/Grid';
// or this, if skipDefaultConversion = true:
// import { Grid as gird } from 'react-bootstrap/lib/Grid';
var importName = memberImport.imported.name;
var replace = transform(opts.transform, importName, matches);
var newImportSpecifier = (opts.skipDefaultConversion)
? memberImport
: types.importDefaultSpecifier(types.identifier(memberImport.local.name));
// @ts-ignore
transforms.push(types.importDeclaration([newImportSpecifier], types.stringLiteral(replace)));
});
if (transforms.length > 0) {
path.replaceWithMultiple(transforms);
}
}
}
exports.default = transformImport;
//# sourceMappingURL=transformImport.js.map