Function onwarn

src/index.js:466–479

(warning, warn)

			},

			onwarn(warning, warn) {
				// https://github.com/rollup/rollup/blob/0fa9758cb7b1976537ae0875d085669e3a21e918/src/utils/error.ts#L324
				if (warning.code === 'UNRESOLVED_IMPORT') {
					stdout(
						`Failed to resolve the module ${warning.source} imported by ${warning.importer}` +
							`\nIs the module installed? Note:` +
							`\n ↳ to inline a module into your bundle, install it to "devDependencies".` +
							`\n ↳ to depend on a module via import/require, install it to "dependencies".`,
					);
					return;
				}

				warn(warning);
			},

			treeshake: {
				propertyReadSideEffects: false,