@angular-devkit/build-optimizer/src/transforms/prefix-classes.js

"use strict";
/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
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    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
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    o["default"] = v;
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var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
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    __setModuleDefault(result, mod);
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Object.defineProperty(exports, "__esModule", { value: true });
exports.getPrefixClassesTransformer = exports.testPrefixClasses = void 0;
const ts = __importStar(require("typescript"));
const ast_utils_1 = require("../helpers/ast-utils");
function testPrefixClasses(content) {
    const exportVarSetter = /(?:export )?(?:var|const)\s+(?:\S+)\s*=\s*/;
    const multiLineComment = /\s*(?:\/\*[\s\S]*?\*\/)?\s*/;
    const newLine = /\s*\r?\n\s*/;
    const regexes = [
        [
            /^/,
            exportVarSetter,
            multiLineComment,
            /\(/,
            multiLineComment,
            /\s*function \(\) {/,
            newLine,
            multiLineComment,
            /function (?:\S+)\([^)]*\) \{/,
            newLine,
        ],
        [
            /^/,
            exportVarSetter,
            multiLineComment,
            /\(/,
            multiLineComment,
            /\s*function \(_super\) {/,
            newLine,
            /\S*\.?__extends\(\S+, _super\);/,
        ],
    ].map((arr) => new RegExp(arr.map((x) => x.source).join(''), 'm'));
    return regexes.some((regex) => regex.test(content));
}
exports.testPrefixClasses = testPrefixClasses;
const superParameterName = '_super';
const extendsHelperName = '__extends';
function getPrefixClassesTransformer() {
    return (context) => {
        const transformer = (sf) => {
            const visitor = (node) => {
                // Add pure comment to downleveled classes.
                if (ts.isVariableStatement(node) && isDownleveledClass(node)) {
                    const varDecl = node.declarationList.declarations[0];
                    const varInitializer = varDecl.initializer;
                    // Update node with the pure comment before the variable declaration initializer.
                    const newNode = ts.updateVariableStatement(node, node.modifiers, ts.updateVariableDeclarationList(node.declarationList, [
                        ts.updateVariableDeclaration(varDecl, varDecl.name, varDecl.type, (0, ast_utils_1.addPureComment)(varInitializer)),
                    ]));
                    // Replace node with modified one.
                    return ts.visitEachChild(newNode, visitor, context);
                }
                // Otherwise return node as is.
                return ts.visitEachChild(node, visitor, context);
            };
            return ts.visitEachChild(sf, visitor, context);
        };
        return transformer;
    };
}
exports.getPrefixClassesTransformer = getPrefixClassesTransformer;
// Determine if a node matched the structure of a downleveled TS class.
function isDownleveledClass(node) {
    if (!ts.isVariableStatement(node)) {
        return false;
    }
    if (node.declarationList.declarations.length !== 1) {
        return false;
    }
    const variableDeclaration = node.declarationList.declarations[0];
    if (!ts.isIdentifier(variableDeclaration.name) || !variableDeclaration.initializer) {
        return false;
    }
    let potentialClass = variableDeclaration.initializer;
    // TS 2.3 has an unwrapped class IIFE
    // TS 2.4 uses a function expression wrapper
    // TS 2.5 uses an arrow function wrapper
    if (ts.isParenthesizedExpression(potentialClass)) {
        potentialClass = potentialClass.expression;
    }
    if (!ts.isCallExpression(potentialClass) || potentialClass.arguments.length > 1) {
        return false;
    }
    let wrapperBody;
    if (ts.isFunctionExpression(potentialClass.expression)) {
        wrapperBody = potentialClass.expression.body;
    }
    else if (ts.isArrowFunction(potentialClass.expression) &&
        ts.isBlock(potentialClass.expression.body)) {
        wrapperBody = potentialClass.expression.body;
    }
    else {
        return false;
    }
    if (wrapperBody.statements.length === 0) {
        return false;
    }
    const functionExpression = potentialClass.expression;
    const functionStatements = wrapperBody.statements;
    // need a minimum of two for a function declaration and return statement
    if (functionStatements.length < 2) {
        return false;
    }
    const firstStatement = functionStatements[0];
    // find return statement - may not be last statement
    let returnStatement;
    for (let i = functionStatements.length - 1; i > 0; i--) {
        if (ts.isReturnStatement(functionStatements[i])) {
            returnStatement = functionStatements[i];
            break;
        }
    }
    if (returnStatement == undefined ||
        returnStatement.expression == undefined ||
        !ts.isIdentifier(returnStatement.expression)) {
        return false;
    }
    if (functionExpression.parameters.length === 0) {
        // potential non-extended class or wrapped es2015 class
        return ((ts.isFunctionDeclaration(firstStatement) || ts.isClassDeclaration(firstStatement)) &&
            firstStatement.name !== undefined &&
            returnStatement.expression.text === firstStatement.name.text);
    }
    else if (functionExpression.parameters.length !== 1) {
        return false;
    }
    // Potential extended class
    const functionParameter = functionExpression.parameters[0];
    if (!ts.isIdentifier(functionParameter.name) ||
        functionParameter.name.text !== superParameterName) {
        return false;
    }
    if (functionStatements.length < 3 || !ts.isExpressionStatement(firstStatement)) {
        return false;
    }
    if (!ts.isCallExpression(firstStatement.expression)) {
        return false;
    }
    const extendCallExpression = firstStatement.expression;
    let functionName;
    if (ts.isIdentifier(extendCallExpression.expression)) {
        functionName = extendCallExpression.expression.text;
    }
    else if (ts.isPropertyAccessExpression(extendCallExpression.expression)) {
        functionName = extendCallExpression.expression.name.text;
    }
    if (!functionName || !functionName.endsWith(extendsHelperName)) {
        return false;
    }
    if (extendCallExpression.arguments.length === 0) {
        return false;
    }
    const lastArgument = extendCallExpression.arguments[extendCallExpression.arguments.length - 1];
    if (!ts.isIdentifier(lastArgument) || lastArgument.text !== functionParameter.name.text) {
        return false;
    }
    const secondStatement = functionStatements[1];
    return (ts.isFunctionDeclaration(secondStatement) &&
        secondStatement.name !== undefined &&
        returnStatement.expression.text === secondStatement.name.text);
}