@angular/core
Version:
Angular - the core framework
80 lines • 11.7 kB
JavaScript
/**
* @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,
hydratedNodes: 0,
hydratedComponents: 0,
dehydratedViewsRemoved: 0,
dehydratedViewsCleanupRuns: 0,
componentsSkippedHydration: 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 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 typeof ngDevMode !== 'undefined' && !!ngDevMode;
}
return false;
}
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This is not necessary, but cuts down on boilerplate for the\n   * perf counters.\n   *\n   * ngDevMode may also be set to false. This can happen in one of a few ways:\n   * - The user explicitly sets `window.ngDevMode = false` somewhere in their app.\n   * - The user calls `enableProdMode()`.\n   * - The URL contains a `ngDevMode=false` text.\n   * Finally, ngDevMode may not have been defined at all.\n   */\n  const ngDevMode: null|NgDevModePerfCounters;\n\n  interface NgDevModePerfCounters {\n    namedConstructors: boolean;\n    firstCreatePass: number;\n    tNode: number;\n    tView: number;\n    rendererCreateTextNode: number;\n    rendererSetText: number;\n    rendererCreateElement: number;\n    rendererAddEventListener: number;\n    rendererSetAttribute: number;\n    rendererRemoveAttribute: number;\n    rendererSetProperty: number;\n    rendererSetClassName: number;\n    rendererAddClass: number;\n    rendererRemoveClass: number;\n    rendererSetStyle: number;\n    rendererRemoveStyle: number;\n    rendererDestroy: number;\n    rendererDestroyNode: number;\n    rendererMoveNode: number;\n    rendererRemoveNode: number;\n    rendererAppendChild: number;\n    rendererInsertBefore: number;\n    rendererCreateComment: number;\n    hydratedNodes: number;\n    hydratedComponents: number;\n    dehydratedViewsRemoved: number;\n    dehydratedViewsCleanupRuns: number;\n    componentsSkippedHydration: number;\n  }\n}\n\nexport function ngDevModeResetPerfCounters(): NgDevModePerfCounters {\n  const locationString = typeof location !== 'undefined' ? location.toString() : '';\n  const newCounters: NgDevModePerfCounters = {\n    namedConstructors: locationString.indexOf('ngDevMode=namedConstructors') != -1,\n    firstCreatePass: 0,\n    tNode: 0,\n    tView: 0,\n    rendererCreateTextNode: 0,\n    rendererSetText: 0,\n    rendererCreateElement: 0,\n    rendererAddEventListener: 0,\n    rendererSetAttribute: 0,\n    rendererRemoveAttribute: 0,\n    rendererSetProperty: 0,\n    rendererSetClassName: 0,\n    rendererAddClass: 0,\n    rendererRemoveClass: 0,\n    rendererSetStyle: 0,\n    rendererRemoveStyle: 0,\n    rendererDestroy: 0,\n    rendererDestroyNode: 0,\n    rendererMoveNode: 0,\n    rendererRemoveNode: 0,\n    rendererAppendChild: 0,\n    rendererInsertBefore: 0,\n    rendererCreateComment: 0,\n    hydratedNodes: 0,\n    hydratedComponents: 0,\n    dehydratedViewsRemoved: 0,\n    dehydratedViewsCleanupRuns: 0,\n    componentsSkippedHydration: 0,\n  };\n\n  // Make sure to refer to ngDevMode as ['ngDevMode'] for closure.\n  const allowNgDevModeTrue = locationString.indexOf('ngDevMode=false') === -1;\n  global['ngDevMode'] = allowNgDevModeTrue && newCounters;\n  return newCounters;\n}\n\n/**\n * This function checks to see if the `ngDevMode` has been set. If yes,\n * then we honor it, otherwise we default to dev mode with additional checks.\n *\n * The idea is that unless we are doing production build where we explicitly\n * set `ngDevMode == false` we should be helping the developer by providing\n * as much early warning and errors as possible.\n *\n * `ɵɵdefineComponent` is guaranteed to have been called before any component template functions\n * (and thus Ivy instructions), so a single initialization there is sufficient to ensure ngDevMode\n * is defined for the entire instruction set.\n *\n * When checking `ngDevMode` on toplevel, always init it before referencing it\n * (e.g. `((typeof ngDevMode === 'undefined' || ngDevMode) && initNgDevMode())`), otherwise you can\n *  get a `ReferenceError` like in https://github.com/angular/angular/issues/31595.\n *\n * Details on possible values for `ngDevMode` can be found on its docstring.\n *\n * NOTE:\n * - changes to the `ngDevMode` name must be synced with `compiler-cli/src/tooling.ts`.\n */\nexport function initNgDevMode(): boolean {\n  // The below checks are to ensure that calling `initNgDevMode` multiple times does not\n  // reset the counters.\n  // If the `ngDevMode` is not an object, then it means we have not created the perf counters\n  // yet.\n  if (typeof ngDevMode === 'undefined' || ngDevMode) {\n    if (typeof ngDevMode !== 'object') {\n      ngDevModeResetPerfCounters();\n    }\n    return typeof ngDevMode !== 'undefined' && !!ngDevMode;\n  }\n  return false;\n}\n"]}