@angular/core/esm2015/src/util/ng_dev_mode.js

Angular - the core framework

/**
 * @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
 */
import { global } from './global';
export function ngDevModeResetPerfCounters() {
    const locationString = typeof location !== 'undefined' ? location.toString() : '';
    const newCounters = {
        namedConstructors: locationString.indexOf('ngDevMode=namedConstructors') != -1,
        firstCreatePass: 0,
        tNode: 0,
        tView: 0,
        rendererCreateTextNode: 0,
        rendererSetText: 0,
        rendererCreateElement: 0,
        rendererAddEventListener: 0,
        rendererSetAttribute: 0,
        rendererRemoveAttribute: 0,
        rendererSetProperty: 0,
        rendererSetClassName: 0,
        rendererAddClass: 0,
        rendererRemoveClass: 0,
        rendererSetStyle: 0,
        rendererRemoveStyle: 0,
        rendererDestroy: 0,
        rendererDestroyNode: 0,
        rendererMoveNode: 0,
        rendererRemoveNode: 0,
        rendererAppendChild: 0,
        rendererInsertBefore: 0,
        rendererCreateComment: 0,
    };
    // Make sure to refer to ngDevMode as ['ngDevMode'] for closure.
    const allowNgDevModeTrue = locationString.indexOf('ngDevMode=false') === -1;
    global['ngDevMode'] = allowNgDevModeTrue && newCounters;
    return newCounters;
}
/**
 * This function checks to see if the `ngDevMode` has been set. If yes,
 * then we honor it, otherwise we default to dev mode with additional checks.
 *
 * The idea is that unless we are doing production build where we explicitly
 * set `ngDevMode == false` we should be helping the developer by providing
 * as much early warning and errors as possible.
 *
 * `ɵɵdefineComponent` is guaranteed to have been called before any component template functions
 * (and thus Ivy instructions), so a single initialization there is sufficient to ensure ngDevMode
 * is defined for the entire instruction set.
 *
 * When using checking `ngDevMode` on toplevel, always init it before referencing it
 * (e.g. `((typeof ngDevMode === 'undefined' || ngDevMode) && initNgDevMode())`), otherwise you can
 *  get a `ReferenceError` like in https://github.com/angular/angular/issues/31595.
 *
 * Details on possible values for `ngDevMode` can be found on its docstring.
 *
 * NOTE:
 * - changes to the `ngDevMode` name must be synced with `compiler-cli/src/tooling.ts`.
 */
export function initNgDevMode() {
    // The below checks are to ensure that calling `initNgDevMode` multiple times does not
    // reset the counters.
    // If the `ngDevMode` is not an object, then it means we have not created the perf counters
    // yet.
    if (typeof ngDevMode === 'undefined' || ngDevMode) {
        if (typeof ngDevMode !== 'object') {
            ngDevModeResetPerfCounters();
        }
        return !!ngDevMode;
    }
    return false;
}
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