roarr
Version:
JSON logger for Node.js and browser.
37 lines • 1.38 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createMockLogger = void 0;
const constants_1 = require("../constants");
const noopLevelMethod = () => {
return undefined;
};
const mockLoggerPrototype = Object.create(Function.prototype);
mockLoggerPrototype.adopt = async function (_routine) {
return _routine();
};
// A mock logger has no observable state: every log method is a noop,
// `getContext` always returns an empty object and the child context is
// discarded. Returning `this` therefore produces a logger indistinguishable
// from a freshly constructed one, while avoiding a function allocation and an
// `Object.setPrototypeOf` call (~75ns) per child.
mockLoggerPrototype.child = function () {
return this;
};
mockLoggerPrototype.getContext = function () {
return {};
};
for (const logLevelName of Object.keys(constants_1.logLevels)) {
mockLoggerPrototype[logLevelName] = noopLevelMethod;
mockLoggerPrototype[logLevelName + 'Once'] = noopLevelMethod;
}
const createMockLogger = (onMessage, parentContext) => {
const log = () => {
return undefined;
};
log.onMessage = onMessage;
log.parentMessageContext = parentContext;
Object.setPrototypeOf(log, mockLoggerPrototype);
return log;
};
exports.createMockLogger = createMockLogger;
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