diff --git a/lib/index.d.ts b/lib/index.d.ts
new file mode 100644
index 00000000..c2b002af
--- /dev/null
+++ b/lib/index.d.ts
@@ -0,0 +1,76 @@
+declare type StringifyOptions = Partial<{
+  /**
+   * A function that alters the behavior of the stringification process, or an
+   * array of String and Number objects that serve as a whitelist for
+   * selecting/filtering the properties of the value object to be included in
+   * the JSON5 string. If this value is null or not provided, all properties
+   * of the object are included in the resulting JSON5 string.
+   */
+  replacer: ((this: any, key: string, value: any) => any) | (string | number)[];
+
+  /**
+   * A String or Number object that's used to insert white space into the
+   * output JSON5 string for readability purposes. If this is a Number, it
+   * indicates the number of space characters to use as white space; this
+   * number is capped at 10 (if it is greater, the value is just 10). Values
+   * less than 1 indicate that no space should be used. If this is a String,
+   * the string (or the first 10 characters of the string, if it's longer than
+   * that) is used as white space. If this parameter is not provided (or is
+   * null), no white space is used. If white space is used, trailing commas
+   * will be used in objects and arrays.
+   */
+  space: string | number;
+
+  /**
+   * A String representing the quote character to use when serializing strings.
+   */
+  quote: string;
+}>
+
+/**
+ * Parses a JSON5 string, constructing the JavaScript value or object described
+ * by the string. An optional reviver function can be provided to perform a
+ * transformation on the resulting object before it is returned.
+ * @param text The string to parse as JSON5.
+ * @param reviver If a function, this prescribes how the value originally
+ * produced by parsing is transformed, before being returned.
+ */
+export function parse(text: string, reviver?: (this: any, key: string, value: any) => any): any;
+
+/**
+ * Converts a JavaScript value to a JSON5 string, optionally replacing values
+ * if a replacer function is specified, or optionally including only the
+ * specified properties if a replacer array is specified.
+ * @param value The value to convert to a JSON5 string.
+ * @param replacer A function that alters the behavior of the stringification
+ * process, or an array of String and Number objects that serve as a whitelist
+ * for selecting/filtering the properties of the value object to be included in
+ * the JSON5 string. If this value is null or not provided, all properties of
+ * the object are included in the resulting JSON5 string.
+ * @param space A String or Number object that's used to insert white space
+ * into the output JSON5 string for readability purposes. If this is a Number,
+ * it indicates the number of space characters to use as white space; this
+ * number is capped at 10 (if it is greater, the value is just 10). Values less
+ * than 1 indicate that no space should be used. If this is a String, the
+ * string (or the first 10 characters of the string, if it's longer than that)
+ * is used as white space. If this parameter is not provided (or is null), no
+ * white space is used. If white space is used, trailing commas will be used in
+ * objects and arrays.
+ */
+export function stringify(value: any, replacer?: ((this: any, key: string, value: any) => any) | (string | number)[], space?: string | number): string;
+
+/**
+ * Converts a JavaScript value to a JSON5 string, optionally replacing values
+ * if a replacer function is specified, or optionally including only the
+ * specified properties if a replacer array is specified.
+ * @param value The value to convert to a JSON5 string.
+ * @param options An object with the following properties:
+ * 
+ * `replacer`: Same as the `replacer` parameter.
+ * 
+ * `space`: Same as the `space` parameter.
+ * 
+ * `quote`: A String representing the quote character to use when serializing
+ * strings.
+ */
+export function stringify(value: any, options?: StringifyOptions): string;
diff --git a/package.json b/package.json
index 9c5b82ea..3b3b79a5 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "module": "dist/index.mjs",
   "bin": "lib/cli.js",
   "browser": "dist/index.js",
+  "types": "lib/index.d.ts",
   "files": [
     "lib/",
     "dist/"