webpack/webpack · error · AbstractMethodError

Abstract method Must be overridden.

Error message

Abstract method Must be overridden.

What it means

Error "Abstract method Must be overridden." thrown in webpack/webpack.

Source

Thrown at lib/RuntimeModule.js:214

	size(type) {
		try {
			const source = this.getGeneratedCode();
			return source ? source.length : 0;
		} catch (_err) {
			return 0;
		}
	}

	/* istanbul ignore next */
	/**
	 * Generates runtime code for this runtime module.
	 * @abstract
	 * @returns {string | null} runtime code
	 */
	generate() {
		const AbstractMethodError = require("./errors/AbstractMethodError");

		throw new AbstractMethodError();
	}

	/**
	 * Gets generated code.
	 * @returns {string | null} runtime code
	 */
	getGeneratedCode() {
		if (this._cachedGeneratedCode) {
			return this._cachedGeneratedCode;
		}
		return (this._cachedGeneratedCode = this.generate());
	}

	/**
	 * Returns true, if the runtime module should get it's own scope.
	 * @returns {boolean} true, if the runtime module should get it's own scope
	 */
	shouldIsolate() {

View on GitHub (pinned to 318421ea8a)

Solutions

1. Implement the abstract method in the RuntimeModule subclass; this error indicates a subclass failed to override a required method.

When it happens

Trigger: Thrown at lib/RuntimeModule.js:214 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of webpack/webpack@318421ea8a (2026-08-03). Data as JSON: /data/errors/30a7476e44cc3c4f.json. Report an issue: GitHub.