ngx-bootstrap-fix-datepicker/schematics/utils/ng-module-imports.js

Native Angular Bootstrap Components

"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
 */
Object.defineProperty(exports, "__esModule", { value: true });
const ts = require("typescript");
/**
 * Whether the Angular module in the given path imports the specifed module class name.
 */
function hasNgModuleImport(tree, modulePath, className) {
    const moduleFileContent = tree.read(modulePath);
    if (!moduleFileContent) {
        throw new Error(`Could not read Angular module file: ${modulePath}`);
    }
    const parsedFile = ts.createSourceFile(modulePath, moduleFileContent.toString(), ts.ScriptTarget.Latest, true);
    let ngModuleMetadata = null;
    const findModuleDecorator = (node) => {
        if (ts.isDecorator(node) && ts.isCallExpression(node.expression) &&
            isNgModuleCallExpression(node.expression)) {
            ngModuleMetadata = node.expression.arguments[0];
            return;
        }
        ts.forEachChild(node, findModuleDecorator);
    };
    ts.forEachChild(parsedFile, findModuleDecorator);
    if (!ngModuleMetadata) {
        throw new Error(`Could not find NgModule declaration inside: "${modulePath}"`);
    }
    /* tslint:disable-next-line: no-non-null-assertion */
    for (const property of ngModuleMetadata.properties) {
        if (!ts.isPropertyAssignment(property) || property.name.getText() !== 'imports' ||
            !ts.isArrayLiteralExpression(property.initializer)) {
            continue;
        }
        /* tslint:disable-next-line: no-any */
        if (property.initializer.elements.some((element) => element.getText() === className)) {
            return true;
        }
    }
    return false;
}
exports.hasNgModuleImport = hasNgModuleImport;
/**
 * Resolves the last identifier that is part of the given expression. This helps resolving
 * identifiers of nested property access expressions (e.g. myNamespace.core.NgModule).
 */
function resolveIdentifierOfExpression(expression) {
    if (ts.isIdentifier(expression)) {
        return expression;
    }
    else if (ts.isPropertyAccessExpression(expression)) {
        return resolveIdentifierOfExpression(expression.expression);
    }
    return null;
}
/** Whether the specified call expression is referring to a NgModule definition. */
function isNgModuleCallExpression(callExpression) {
    if (!callExpression.arguments.length ||
        !ts.isObjectLiteralExpression(callExpression.arguments[0])) {
        return false;
    }
    const decoratorIdentifier = resolveIdentifierOfExpression(callExpression.expression);
    return decoratorIdentifier ? decoratorIdentifier.text === 'NgModule' : false;
}
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