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node_modules/@11ty/eleventy/src/Util/GetJavaScriptData.js

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+import EleventyBaseError from "../Errors/EleventyBaseError.js";
+
+class JavaScriptInvalidDataFormatError extends EleventyBaseError {}
+
+export default async function (inst, inputPath, key = "data", options = {}) {
+	let { mixins, isObjectRequired } = Object.assign(
+		{
+			mixins: {},
+			isObjectRequired: true,
+		},
+		options,
+	);
+
+	if (inst && key in inst) {
+		// get extra data from `data` method,
+		// either as a function or getter or object literal
+		let result = await (typeof inst[key] === "function"
+			? Object.keys(mixins).length > 0
+				? inst[key].call(mixins)
+				: inst[key]()
+			: inst[key]);
+
+		if (isObjectRequired && typeof result !== "object") {
+			throw new JavaScriptInvalidDataFormatError(
+				`Invalid data format returned from ${inputPath}: typeof ${typeof result}`,
+			);
+		}
+		return result;
+	}
+}