@lodestar/prover/lib/utils/file.js

A Typescript implementation of the Ethereum Consensus light client

import fs from "node:fs";
import path from "node:path";
import yaml from "js-yaml";
const { load, FAILSAFE_SCHEMA, Type } = yaml;
var FileFormat;
(function (FileFormat) {
    FileFormat["json"] = "json";
    FileFormat["yaml"] = "yaml";
    FileFormat["yml"] = "yml";
    FileFormat["toml"] = "toml";
})(FileFormat || (FileFormat = {}));
const yamlSchema = FAILSAFE_SCHEMA.extend({
    implicit: [
        new Type("tag:yaml.org,2002:str", {
            kind: "scalar",
            construct: function construct(data) {
                return data !== null ? data : "";
            },
        }),
    ],
});
/**
 * Parse file contents as Json.
 */
function parse(contents, fileFormat) {
    switch (fileFormat) {
        case FileFormat.json:
            return JSON.parse(contents);
        case FileFormat.yaml:
        case FileFormat.yml:
            return load(contents, { schema: yamlSchema });
        default:
            return contents;
    }
}
/**
 * Read a JSON serializable object from a file
 *
 * Parse either from json, yaml, or toml
 * Optional acceptedFormats object can be passed which can be an array of accepted formats, in future can be extended to include parseFn for the accepted formats
 */
export function readFile(filepath, acceptedFormats) {
    const fileFormat = path.extname(filepath).substr(1);
    if (acceptedFormats && !acceptedFormats.includes(fileFormat))
        throw new Error(`UnsupportedFileFormat: ${filepath}`);
    const contents = fs.readFileSync(filepath, "utf-8");
    return parse(contents, fileFormat);
}
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