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const DATA_KEYS = ["page", "eleventy"];
function augmentFunction(fn, options = {}) {
let t = typeof fn;
if (t !== "function") {
throw new Error(
"Invalid type passed to `augmentFunction`. A function was expected and received: " + t,
);
}
/** @this {object} */
return function (...args) {
let context = augmentObject(this || {}, options);
return fn.call(context, ...args);
};
}
function augmentObject(targetObject, options = {}) {
options = Object.assign(
{
source: undefined, // where to copy from
overwrite: true,
lazy: false, // lazily fetch the property
// getter: function() {},
},
options,
);
for (let key of DATA_KEYS) {
// Skip if overwrite: false and prop already exists on target
if (!options.overwrite && targetObject[key]) {
continue;
}
if (options.lazy) {
let value;
if (typeof options.getter == "function") {
value = () => options.getter(key, options.source);
} else {
value = () => options.source?.[key];
}
// lazy getter important for Liquid strictVariables support
Object.defineProperty(targetObject, key, {
writable: true,
configurable: true,
enumerable: true,
value,
});
} else {
let value;
if (typeof options.getter == "function") {
value = options.getter(key, options.source);
} else {
value = options.source?.[key];
}
if (value) {
targetObject[key] = value;
}
}
}
return targetObject;
}
export { DATA_KEYS as augmentKeys, augmentFunction, augmentObject };
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