避免重复警告

\Avoiding duplicate warnings

作为最佳实践,每个进程只应触发一次警告。为此,则将 emitWarning() 放在布尔值后面。

\As a best practice, warnings should be emitted only once per process. To do so, place the emitWarning() behind a boolean.

import { emitWarning } from 'node:process';
function emitMyWarning() {
 if (!emitMyWarning.warned) {
 emitMyWarning.warned = true;
 emitWarning('Only warn once!');
 }
}
emitMyWarning();
// Emits: (node: 56339) Warning: Only warn once!
emitMyWarning();
// Emits nothingconst { emitWarning } = require('node:process');
function emitMyWarning() {
 if (!emitMyWarning.warned) {
 emitMyWarning.warned = true;
 emitWarning('Only warn once!');
 }
}
emitMyWarning();
// Emits: (node: 56339) Warning: Only warn once!
emitMyWarning();
// Emits nothing拷贝