Added typescript definitions and jsdocs

lib/index.d.ts

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+// Type definitions for properties 1.0
+// Project: https://github.com/gagle/node-properties
+// Definitions by: Inrix <https://github.com/Inrixia>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 4.0
+
+export interface ParseOptions {
+    /**
+     * By default `parse()` reads a String.
+     * If you want to read a file, set this option to true.
+     * If this option is used, the callback is mandatory.
+     * It gets 2 parameters, a possible error and the object with all the properties.
+     */
+    path?: boolean;
+
+    /**
+     * Allows you to add additional comment tokens.
+     * The token must be a single printable non-whitespae ascii character.
+     * If the `strict` option is not set, the tokens `#` and `!` are parsed as comment tokens.
+     *
+     * @example
+     * comments: ";"
+     * @example
+     * comments: [";", "&#064;"]
+     */
+    comments?: string | string[];
+
+    /**
+     * Allows you to add additional separator tokens.
+     * The token must be a single printable non-whitespae ascii character.
+     * If the `strict` option is not set, the tokens `=` and `:` are parsed as comment tokens.
+     *
+     * @example
+     * separators: "-"
+     * @example
+     * separators: ["-", ">"]
+     */
+    separators?: string | string[];
+
+    /**
+     * This option can be used with the `comments` and `separators` options.
+     * If true, **only** the tokens specified in these options are used to parse comments and separators.
+     */
+    strict?: boolean;
+
+    /**
+     * Parses INI sections.
+     * Read the INI section for further details.
+     *
+     * @link https://www.npmjs.com/package/properties#ini
+     */
+    sections?: boolean;
+
+    /**
+     * Parses dot separated keys as JavaScript objects.
+     *
+     * Look at the namespaces section for further details.
+     * @link https://www.npmjs.com/package/properties#namespaces
+     */
+    namespaces?: boolean;
+
+    /**
+     * Allows you to read the value of a key while the file is being parsed.
+     *
+     * Look at the variables section for further details.
+     * @link https://www.npmjs.com/package/properties#variables
+     */
+    variables?: boolean;
+
+    /**
+     * External variables can be passed to the file if the variables option is enabled.
+     *
+     * Look at the variables section for further details.
+     * @link https://www.npmjs.com/package/properties#variables
+     */
+    vars?: boolean;
+
+    /**
+     * Files can be linked and imported with the include key.
+     * If this option is used, the callback is mandatory.
+     *
+     * Look at the include section for further details.
+     * @link https://www.npmjs.com/package/properties#include
+     */
+    include?: boolean;
+
+    /**
+     * Each property or section can be removed or modified from the final object.
+     * It's similar to the reviver of the `JSON.parse()` function.
+     *
+     * The reviver it's exactly the same as the replacer from `stringify()`.
+     * The same function can be reused.
+     *
+     * The callback gets 3 parameters: key, value and section.
+     *
+     * A property has a key and a value and can belong to a section.
+     * If it's a global property, the section is set to null.
+     * If **undefined** is returned, the property will be removed from the final object, otherwise the returned value will be used as the property value.
+     *
+     * If the key and the value are set to null, then it's a section line.
+     * If it returns a falsy value, it won't be added to the final object, the entire section _including all the properties_ will be discarded.
+     * If it returns a truthy value, the section is parsed.
+     *
+     * For your convenience, to know whether the line is a property or section you can access to `this.isProperty` and `this.isSection` from inside the replacer function.
+     * Also, `this.assert()` can be used to return the default value, the unmodified value that will be used to parse the line.
+     *
+     * Look at the reviver example for further details.
+     * @link https://github.com/gagle/node-properties/blob/master/examples/reviver/reviver.js
+     */
+    reviver?: (this: Context, key: any, value: any) => any;
+}
+
+export interface Context {
+    assert(): any;
+}
+
+/**
+ * Parses a .properties string.
+ *
+ * @param data
+ * @param options
+ */
+export function parse(data: string, options?: ParseOptions): object;
+
+/**
+ * Parses a .properties string.
+ *
+ * If a callback is given, the result is returned as the second parameter. Some options will require a callback.
+ *
+ * @param data
+ * @param options
+ * @param cb
+ */
+export function parse(
+    data: string,
+    options: ParseOptions | undefined,
+    cb: (err: any, result: object | undefined) => void,
+): void;
+
+export interface StringifyOptions {
+    /**
+     * By default `stringify()` returns a string.
+     * If you want to write it to a file, use this option and pass the path of a file.
+     * If this option is used, the callback is mandatory.
+     * It gets two parameters, a possible error and the string.
+     */
+    path?: string;
+
+    /**
+     * The token to use to write comments.
+     * It must be a single printable non-whitespace ascii character.
+     * @default `#`
+     */
+    comment?: string;
+
+    /**
+     * The token to use to separate keys from values.
+     * It must be a single printable non-whitespace ascii character.
+     * @default `=`
+     */
+    separator?: string;
+
+    /**
+     * The .properties specification uses iso 8859-1 (latin-1) as a default encoding.
+     * In the other hand, Node.js has a utf8 default encoding.
+     * This means that if you want a full compatibility with Java, that is, you are generating a .properties file that is going to be read by a Java program, then set this option to true.
+     * This will encode all ascii extended and multibyte characters to their unicode string representation (`\uXXXX`).
+     *
+     * Non-printable control codes (control sets 0 and 1) are always encoded as unicode strings except `\t`, `\n`, `\f` and `\r`.
+     *
+     * If you are in a platform that can handle utf8 strings, e.g. Node.js, you don't need to use this option.
+     */
+    unicode?: boolean;
+
+    /**
+     * Each property or section can be removed or modified from the final string.
+     * It's similar to the replacer of the `JSON.stringify()` function.
+     *
+     * The replacer it's exatcly the same as the reviver from `parse()`.
+     * The same function can be reused.
+     *
+     * The callback gets three parameters: key, value and section.
+     *
+     * A property has a key and a value and can belong to a section.
+     * If it's a global property, the section is set to null.
+     * If **undefined** is returned, the property won't be stringified, otherwise the returned value will be used as the property value.
+     *
+     * If the key and the value are set to null, then it's a section line.
+     * If it returns a falsy value, it won't be added to the final string, the entire section _including all the properties_ will be discarded.
+     * If it returns a truthy value, the section is stringified.
+     *
+     * For your convenience, to know whether the line is a property or section you can access to `this.isProperty` and `this.isSection` from inside the replacer function.
+     * Also, `this.assert()` can be used to return the default value, the unmodified value that will be used to stringify the line.
+     *
+     * Look at the replacer example for further details.
+     * @link https://github.com/gagle/node-properties/blob/master/examples/replacer.js
+     */
+    replacer?: (this: Context, key: string, value: any) => any;
+}
+
+/**
+ * Stringifies an `object` or a `Stringifier`.
+ *
+ * If you don't need to add sections or comments simply pass an object, otherwise use a `Stringifier`.
+ *
+ * @param obj
+ * @param options
+ */
+export function stringify(obj: object, options?: StringifyOptions): string;
+
+/**
+ * Stringifies an `object` or a `Stringifier`.
+ *
+ * If you don't need to add sections or comments simply pass an object, otherwise use a `Stringifier`.
+ *
+ * The callback is only necessary when the `path` option is used.
+ *
+ * @param obj
+ * @param options
+ * @param cb
+ */
+export function stringify(
+    obj: object,
+    options: StringifyOptions | undefined,
+    cb: (err: any, result: string) => void,
+): void;
+
+/**
+ * This class is used when you want to add sections or comments to the final string.
+ *
+ * To create a Stringifier use the `createStringifier()` function.
+ *
+ * Look at the stringify-ini example for further details.
+ * @link https://github.com/gagle/node-properties/blob/master/examples/ini/stringify-ini.js
+ */
+export interface Stringifier {
+    /**
+     * Writes a header comment.
+     * It will be written to the top of the final string.
+     * Returns the Stringifier being used.
+     */
+    header(comment: string): this;
+
+    /**
+     * Writes a property line.
+     * It takes an object with three options: `key`, `value` and comment.
+     * Both the key and the value are converted into a string automatically.
+     * Returns the Stringifier being used.
+     */
+    property(obj: { key?: any; value?: any; comment?: string }): this;
+
+    /**
+     * Writes a section line.
+     * It gets an object with two options: `name` and `comment`.
+     * The name is converted into a string.
+     * If you don't need to write a comment, you can pass the name instead of an object.
+     * Returns the stringifier being used.
+     */
+    section(obj: string | { name: string; comment?: string }): this;
+}
+
+/**
+ * Returns a new `Stringifier` instance.
+ */
+export function createStringifier(): Stringifier;