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class EleventyReservedDataError extends TypeError {}
class ReservedData {
static properties = [
// "pkg", // Object.freeze’d upstream
// "eleventy", // Object.freeze’d upstream
// "page" is only frozen for specific subproperties below
"content",
"collections",
];
static pageProperties = [
"date",
"inputPath",
"fileSlug",
"filePathStem",
"outputFileExtension",
"templateSyntax",
"url",
"outputPath",
// not yet `excerpt` or `lang` set via front matter and computed data
];
// Check in the data cascade for reserved data properties.
static getReservedKeys(data) {
if (!data) {
return [];
}
let keys = this.properties.filter((key) => {
return key in data;
});
if ("page" in data) {
if (typeof data.page === "object") {
for (let key of this.pageProperties) {
if (key in data.page) {
keys.push(`page.${key}`);
}
}
} else {
// fail `page` when set to non-object values.
keys.push("page");
}
}
return keys;
}
static check(data) {
let reserved = ReservedData.getReservedKeys(data);
if (reserved.length === 0) {
return;
}
let error = new EleventyReservedDataError(
`Cannot override reserved Eleventy properties: ${reserved.join(", ")}`,
);
error.reservedNames = reserved;
throw error;
}
static isReservedDataError(e) {
return e instanceof EleventyReservedDataError;
}
}
export default ReservedData;
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