diff --git a/lib/dashdash.d.ts b/lib/dashdash.d.ts
new file mode 100644
index 0000000..ce2bc5a
--- /dev/null
+++ b/lib/dashdash.d.ts
@@ -0,0 +1,290 @@
+// Type definitions for dashdash 1.14
+// Project: https://github.com/trentm/node-dashdash#readme
+
+/// <reference types="node" />
+
+export class Parser {
+    constructor(config: ParserConfiguration);
+
+    bashCompletion(args: BashCompletionConfiguration): string;
+
+    help(config?: HelpConfiguration): string;
+
+    parse(inputs?: string[] | ParsingConfiguration): Results;
+}
+
+export function addOptionType(optionType: OptionType): void;
+
+export function bashCompletionFromOptions(args: BashCompletionConfiguration): string;
+
+export function bashCompletionSpecFromOptions(args: BashCompletionSpecConfiguration): string;
+
+export function createParser(config: ParserConfiguration): Parser;
+
+export function getOptionType(name: string): OptionType;
+
+export function parse(config: ParsingConfiguration): Results;
+
+export interface Results {
+    [key: string]: any;
+    _order: Arg[];
+    _args: string[];
+}
+
+export interface Arg {
+    name: string;
+    value: any;
+    from: string;
+}
+
+/**
+ * Used by node-cmdln to put together a synopsis of options for a command
+ */
+export function synopsisFromOpt(o: Option): string;
+
+export type Option = OptionWithoutAliases | OptionWithAliases;
+
+export interface ParsingConfiguration {
+    /**
+     * The argv to parse. Defaults to `process.argv`.
+     */
+    argv?: string[];
+
+    /**
+     * The index into argv at which options/args begin.  Default is 2, as appropriate for `process.argv`.
+     */
+    slice?: number;
+
+    /**
+     * The env to use for 'env' entries in the option specs. Defaults to `process.env`.
+     */
+    env?: NodeJS.ProcessEnv;
+
+    options?: Array<Option | Group>;
+}
+
+export interface ParserConfiguration {
+    /**
+     * Array of option specs.
+     */
+    options: Array<Option | Group>;
+
+    /**
+     * Whether to throw on unknown options.
+     * If false, then unknown args are included in the _args array.
+     * Default: false
+     */
+    allowUnknown?: boolean;
+
+    /**
+     * Whether to allow interspersed arguments (non-options) and options.
+     *
+     * E.g.:
+     *   node tool.js arg1 arg2 -v
+     *
+     * '-v' is after some args here. If `interspersed: false` then '-v'
+     *  would not be parsed out. Note that regardless of `interspersed`
+     * the presence of '--' will stop option parsing, as all good
+     * option parsers should.
+     *
+     * Default: true
+     */
+    interspersed?: boolean;
+}
+
+export interface OptionWithoutAliases extends OptionBase {
+    /**
+     * The option name
+     */
+    name: string;
+}
+
+export interface OptionWithAliases extends OptionBase {
+    /**
+     * The option name and aliases. The first name (if more than one given) is the key for the parsed `opts` object.
+     */
+    names: string[];
+}
+
+export interface OptionBase {
+    /**
+     * One of: bool, string, number, integer, positiveInteger, arrayOfBool, arrayOfString,
+     * arrayOfNumber, arrayOfInteger, arrayOfPositiveInteger, arrayOfDate,
+     * date (epoch seconds, e.g. 1396031701, or ISO 8601 format YYYY-MM-DD[THH:MM:SS[.sss][Z]], e.g. "2014-03-28T18:35:01.489Z").
+     * You can add your own custom option types with `dashdash.addOptionType`
+     * These names attempt to match with asserts on `assert-plus`.
+     */
+    type: string;
+
+    /**
+     * This is used for Bash completion for an option argument.
+     * If not specified, then the value of type is used. Any string may be specified, but only the following values have meaning:
+     *  - none: Provide no completions.
+     *  - file: Bash's default completion (i.e. complete -o default), which includes filenames.
+     *  - Any string FOO for which a function complete_FOO Bash function is defined.
+     * This is for custom completions for a given tool.
+     * Typically these custom functions are provided in the specExtra argument to dashdash.bashCompletionFromOptions().
+     */
+    completionType?: string;
+
+    /**
+     * An environment variable name (or names) that can be used as a fallback for this option.
+     * An environment variable is only used as a fallback, i.e. it is ignored if the associated option is given in `argv`.
+     */
+    env?: string | string[];
+
+    /**
+     * Used for parser.help() output.
+     */
+    help?: string;
+
+    /**
+     * Used in help output as the placeholder for the option argument.
+     */
+    helpArg?: string;
+
+    /**
+     * Set this to false to have that option's help not be text wrapped in <parser>.help() output.
+     */
+    helpWrap?: boolean;
+
+    /**
+     * A default value used for this option, if the option isn't specified in argv.
+     */
+    default?: string;
+
+    /**
+     * If true, help output will not include this option.
+     */
+    hidden?: boolean;
+}
+
+export interface Group {
+    group: string;
+}
+
+export interface OptionType {
+    name: string;
+    takesArg: boolean;
+    helpArg: string;
+    parseArg(option: Option, optstr: string, arg: string): any;
+    array?: boolean;
+    arrayFlatten?: boolean;
+    default?: any;
+    completionType?: any;
+}
+
+export interface BashCompletionConfiguration {
+    /**
+     * The tool name.
+     */
+    name: string;
+
+    /**
+     * The array of dashdash option specs.
+     */
+    options?: Array<Option | Group>;
+
+    /**
+     * Extra Bash code content to add
+     * to the end of the "spec". Typically this is used to append Bash
+     * "complete_TYPE" functions for custom option types.
+     */
+    specExtra?: string;
+
+    /**
+     * Array of completion types for positional args (i.e. non-options).
+     * If not given, positional args will use Bash's 'default' completion.
+     */
+    argtypes?: string[];
+}
+
+export interface BashCompletionSpecConfiguration {
+    /**
+     * The array of dashdash option specs.
+     */
+    options: Array<Option | Group>;
+
+    /**
+     * A context string for the "local cmd*"
+     * vars in the spec. By default it is the empty string. When used to
+     * scope for completion on a *sub-command*.
+     */
+    context?: string;
+
+    /**
+     * By default
+     * hidden options and subcmds are "excluded". Here excluded means they
+     * won't be offered as a completion, but if used, their argument type
+     * will be completed. "Hidden" options and subcmds are ones with the
+     * `hidden: true` attribute to exclude them from default help output.
+     */
+    includeHidden?: boolean;
+
+    /**
+     * Array of completion types for positional args (i.e. non-options).
+     * If not given, positional args will use Bash's 'default' completion.
+     */
+    argtypes?: string[];
+}
+
+export interface HelpConfiguration {
+    /**
+     * Set to a number (for that many spaces) or a string for the literal indent.
+     * Default: 4
+     */
+    indent?: number | string;
+
+    /**
+     * Set to a number (for that many spaces) or a string for the literal indent.
+     * This indent applies to group heading lines, between normal option lines.
+     * Default: half length of `indent`
+     */
+    headingIndent?: number | string;
+
+    /**
+     * By default the names are sorted to put the short opts first (i.e. '-h, --help' preferred to '--help, -h').
+     * Set to 'none' to not do this sorting.
+     * Default: 'length'
+     */
+    nameSort?: string;
+
+    /**
+     * Note that reflow is just done on whitespace so a long token in the option help can overflow maxCol.
+     * Default: 80
+     */
+    maxCol?: number;
+
+    /**
+     * If not set a reasonable value will be determined between minHelpCol and maxHelpCol.
+     */
+    helpCol?: number;
+
+    /**
+     * Default: 20
+     */
+    minHelpCol?: number;
+
+    /**
+     * Default: 40
+     */
+    maxHelpCol?: number;
+
+    /**
+     * Set to `false` to have option `help` strings not be textwrapped to the helpCol..maxCol range.
+     * Default: true
+     */
+    helpWrap?: boolean;
+
+    /**
+     * If the option has associated environment variables (via the env option spec attribute), then append mentioned of those envvars to the help string.
+     * Default: false
+     */
+    includeEnv?: boolean;
+
+    /**
+     * If the option has a default value (via the default option spec attribute, or a default on the option's type), then a "Default: VALUE" string will be appended to the help string.
+     * Default: false
+     */
+    includeDefault?: boolean;
+}
diff --git a/package.json b/package.json
index a11e1f5..32ffa89 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
         "url": "git://github.com/trentm/node-dashdash.git"
     },
     "main": "./lib/dashdash.js",
+    "types": "./lib/dashdash.d.ts",
     "dependencies": {
         "assert-plus": "^1.0.0"
     },