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imports-cache.js
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Fri, Dec 13, 08:37

imports-cache.js
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"use strict";
exports.__esModule = true;
exports.default = void 0;
var _babel = _interopRequireWildcard(require("@babel/core"));
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
const {
types: t
} = _babel.default || _babel;
class ImportsCache {
constructor(resolver) {
this._imports = new WeakMap();
this._anonymousImports = new WeakMap();
this._lastImports = new WeakMap();
this._resolver = resolver;
}
storeAnonymous(programPath, url, // eslint-disable-next-line no-undef
getVal) {
const key = this._normalizeKey(programPath, url);
const imports = this._ensure(this._anonymousImports, programPath, Set);
if (imports.has(key)) return;
const node = getVal(programPath.node.sourceType === "script", t.stringLiteral(this._resolver(url)));
imports.add(key);
this._injectImport(programPath, node);
}
storeNamed(programPath, url, name, getVal) {
const key = this._normalizeKey(programPath, url, name);
const imports = this._ensure(this._imports, programPath, Map);
if (!imports.has(key)) {
const {
node,
name: id
} = getVal(programPath.node.sourceType === "script", t.stringLiteral(this._resolver(url)), t.identifier(name));
imports.set(key, id);
this._injectImport(programPath, node);
}
return t.identifier(imports.get(key));
}
_injectImport(programPath, node) {
const lastImport = this._lastImports.get(programPath);
let newNodes;
if (lastImport && lastImport.node && // Sometimes the AST is modified and the "last import"
// we have has been replaced
lastImport.parent === programPath.node && lastImport.container === programPath.node.body) {
newNodes = lastImport.insertAfter(node);
} else {
newNodes = programPath.unshiftContainer("body", node);
}
const newNode = newNodes[newNodes.length - 1];
this._lastImports.set(programPath, newNode);
/*
let lastImport;
programPath.get("body").forEach(path => {
if (path.isImportDeclaration()) lastImport = path;
if (
path.isExpressionStatement() &&
isRequireCall(path.get("expression"))
) {
lastImport = path;
}
if (
path.isVariableDeclaration() &&
path.get("declarations").length === 1 &&
(isRequireCall(path.get("declarations.0.init")) ||
(path.get("declarations.0.init").isMemberExpression() &&
isRequireCall(path.get("declarations.0.init.object"))))
) {
lastImport = path;
}
});*/
}
_ensure(map, programPath, Collection) {
let collection = map.get(programPath);
if (!collection) {
collection = new Collection();
map.set(programPath, collection);
}
return collection;
}
_normalizeKey(programPath, url, name = "") {
const {
sourceType
} = programPath.node; // If we rely on the imported binding (the "name" parameter), we also need to cache
// based on the sourceType. This is because the module transforms change the names
// of the import variables.
return `${name && sourceType}::${url}::${name}`;
}
}
exports.default = ImportsCache;

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