# Changelog

All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.

### [21.0.1](https://github.com/yargs/yargs-parser/compare/yargs-parser-v21.0.0...yargs-parser-v21.0.1) (2022-02-27)


### Bug Fixes

* return deno env object ([#432](https://github.com/yargs/yargs-parser/issues/432)) ([b00eb87](https://github.com/yargs/yargs-parser/commit/b00eb87b4860a890dd2dab0d6058241bbfd2b3ec))

## [21.0.0](https://www.github.com/yargs/yargs-parser/compare/yargs-parser-v20.2.9...yargs-parser-v21.0.0) (2021-11-15)


### ⚠ BREAKING CHANGES

* drops support for 10 (#421)

### Bug Fixes

* esm json import ([#416](https://www.github.com/yargs/yargs-parser/issues/416)) ([90f970a](https://www.github.com/yargs/yargs-parser/commit/90f970a6482dd4f5b5eb18d38596dd6f02d73edf))
* parser should preserve inner quotes ([#407](https://www.github.com/yargs/yargs-parser/issues/407)) ([ae11f49](https://www.github.com/yargs/yargs-parser/commit/ae11f496a8318ea8885aa25015d429b33713c314))


### Code Refactoring

* drops support for 10 ([#421](https://www.github.com/yargs/yargs-parser/issues/421)) ([3aaf878](https://www.github.com/yargs/yargs-parser/commit/3aaf8784f5c7f2aec6108c1c6a55537fa7e3b5c1))

### [20.2.9](https://www.github.com/yargs/yargs-parser/compare/yargs-parser-v20.2.8...yargs-parser-v20.2.9) (2021-06-20)


### Bug Fixes

* **build:** fixed automated release pipeline ([1fe9135](https://www.github.com/yargs/yargs-parser/commit/1fe9135884790a083615419b2861683e2597dac3))

### [20.2.8](https://www.github.com/yargs/yargs-parser/compare/yargs-parser-v20.2.7...yargs-parser-v20.2.8) (2021-06-20)


### Bug Fixes

* **locale:** Turkish camelize and decamelize issues with toLocaleLowerCase/toLocaleUpperCase ([2617303](https://www.github.com/yargs/yargs-parser/commit/261730383e02448562f737b94bbd1f164aed5143))
* **perf:** address slow parse when using unknown-options-as-args ([#394](https://www.github.com/yargs/yargs-parser/issues/394)) ([441f059](https://www.github.com/yargs/yargs-parser/commit/441f059d585d446551068ad213db79ac91daf83a))
* **string-utils:** detect [0,1] ranged values as numbers ([#388](https://www.github.com/yargs/yargs-parser/issues/388)) ([efcc32c](https://www.github.com/yargs/yargs-parser/commit/efcc32c2d6b09aba31abfa2db9bd947befe5586b))

### [20.2.7](https://www.github.com/yargs/yargs-parser/compare/v20.2.6...v20.2.7) (2021-03-10)


### Bug Fixes

* **deno:** force release for Deno ([6687c97](https://www.github.com/yargs/yargs-parser/commit/6687c972d0f3ca7865a97908dde3080b05f8b026))

### [20.2.6](https://www.github.com/yargs/yargs-parser/compare/v20.2.5...v20.2.6) (2021-02-22)


### Bug Fixes

* **populate--:** -- should always be array ([#354](https://www.github.com/yargs/yargs-parser/issues/354)) ([585ae8f](https://www.github.com/yargs/yargs-parser/commit/585ae8ffad74cc02974f92d788e750137fd65146))

### [20.2.5](https://www.github.com/yargs/yargs-parser/compare/v20.2.4...v20.2.5) (2021-02-13)


### Bug Fixes

* do not lowercase camel cased string ([#348](https://www.github.com/yargs/yargs-parser/issues/348)) ([5f4da1f](https://www.github.com/yargs/yargs-parser/commit/5f4da1f17d9d50542d2aaa206c9806ce3e320335))

### [20.2.4](https://www.github.com/yargs/yargs-parser/compare/v20.2.3...v20.2.4) (2020-11-09)


### Bug Fixes

* **deno:** address import issues in Deno ([#339](https://www.github.com/yargs/yargs-parser/issues/339)) ([3b54e5e](https://www.github.com/yargs/yargs-parser/commit/3b54e5eef6e9a7b7c6eec7c12bab3ba3b8ba8306))

### [20.2.3](https://www.github.com/yargs/yargs-parser/compare/v20.2.2...v20.2.3) (2020-10-16)


### Bug Fixes

* **exports:** node 13.0 and 13.1 require the dotted object form _with_ a string fallback ([#336](https://www.github.com/yargs/yargs-parser/issues/336)) ([3ae7242](https://www.github.com/yargs/yargs-parser/commit/3ae7242040ff876d28dabded60ac226e00150c88))

### [20.2.2](https://www.github.com/yargs/yargs-parser/compare/v20.2.1...v20.2.2) (2020-10-14)


### Bug Fixes

* **exports:** node 13.0-13.6 require a string fallback ([#333](https://www.github.com/yargs/yargs-parser/issues/333)) ([291aeda](https://www.github.com/yargs/yargs-parser/commit/291aeda06b685b7a015d83bdf2558e180b37388d))

### [20.2.1](https://www.github.com/yargs/yargs-parser/compare/v20.2.0...v20.2.1) (2020-10-01)


### Bug Fixes

* **deno:** update types for deno ^1.4.0 ([#330](https://www.github.com/yargs/yargs-parser/issues/330)) ([0ab92e5](https://www.github.com/yargs/yargs-parser/commit/0ab92e50b090f11196334c048c9c92cecaddaf56))

## [20.2.0](https://www.github.com/yargs/yargs-parser/compare/v20.1.0...v20.2.0) (2020-09-21)


### Features

* **string-utils:** export looksLikeNumber helper ([#324](https://www.github.com/yargs/yargs-parser/issues/324)) ([c8580a2](https://www.github.com/yargs/yargs-parser/commit/c8580a2327b55f6342acecb6e72b62963d506750))


### Bug Fixes

* **unknown-options-as-args:** convert positionals that look like numbers ([#326](https://www.github.com/yargs/yargs-parser/issues/326)) ([f85ebb4](https://www.github.com/yargs/yargs-parser/commit/f85ebb4face9d4b0f56147659404cbe0002f3dad))

## [20.1.0](https://www.github.com/yargs/yargs-parser/compare/v20.0.0...v20.1.0) (2020-09-20)


### Features

* adds parse-positional-numbers configuration ([#321](https://www.github.com/yargs/yargs-parser/issues/321)) ([9cec00a](https://www.github.com/yargs/yargs-parser/commit/9cec00a622251292ffb7dce6f78f5353afaa0d4c))


### Bug Fixes

* **build:** update release-please; make labels kick off builds ([#323](https://www.github.com/yargs/yargs-parser/issues/323)) ([09f448b](https://www.github.com/yargs/yargs-parser/commit/09f448b4cd66e25d2872544718df46dab8af062a))

## [20.0.0](https://www.github.com/yargs/yargs-parser/compare/v19.0.4...v20.0.0) (2020-09-09)


### ⚠ BREAKING CHANGES

* do not ship type definitions (#318)

### Bug Fixes

* only strip camel case if hyphenated ([#316](https://www.github.com/yargs/yargs-parser/issues/316)) ([95a9e78](https://www.github.com/yargs/yargs-parser/commit/95a9e785127b9bbf2d1db1f1f808ca1fb100e82a)), closes [#315](https://www.github.com/yargs/yargs-parser/issues/315)


### Code Refactoring

* do not ship type definitions ([#318](https://www.github.com/yargs/yargs-parser/issues/318)) ([8fbd56f](https://www.github.com/yargs/yargs-parser/commit/8fbd56f1d0b6c44c30fca62708812151ca0ce330))

### [19.0.4](https://www.github.com/yargs/yargs-parser/compare/v19.0.3...v19.0.4) (2020-08-27)


### Bug Fixes

* **build:** fixing publication ([#310](https://www.github.com/yargs/yargs-parser/issues/310)) ([5d3c6c2](https://www.github.com/yargs/yargs-parser/commit/5d3c6c29a9126248ba601920d9cf87c78e161ff5))

### [19.0.3](https://www.github.com/yargs/yargs-parser/compare/v19.0.2...v19.0.3) (2020-08-27)


### Bug Fixes

* **build:** switch to action for publish ([#308](https://www.github.com/yargs/yargs-parser/issues/308)) ([5c2f305](https://www.github.com/yargs/yargs-parser/commit/5c2f30585342bcd8aaf926407c863099d256d174))

### [19.0.2](https://www.github.com/yargs/yargs-parser/compare/v19.0.1...v19.0.2) (2020-08-27)


### Bug Fixes

* **types:** envPrefix should be optional ([#305](https://www.github.com/yargs/yargs-parser/issues/305)) ([ae3f180](https://www.github.com/yargs/yargs-parser/commit/ae3f180e14df2de2fd962145f4518f9aa0e76523))

### [19.0.1](https://www.github.com/yargs/yargs-parser/compare/v19.0.0...v19.0.1) (2020-08-09)


### Bug Fixes

* **build:** push tag created for deno ([2186a14](https://www.github.com/yargs/yargs-parser/commit/2186a14989749887d56189867602e39e6679f8b0))

## [19.0.0](https://www.github.com/yargs/yargs-parser/compare/v18.1.3...v19.0.0) (2020-08-09)


### ⚠ BREAKING CHANGES

* adds support for ESM and Deno (#295)
* **ts:** projects using `@types/yargs-parser` may see variations in type definitions.
* drops Node 6. begin following Node.js LTS schedule (#278)

### Features

* adds support for ESM and Deno ([#295](https://www.github.com/yargs/yargs-parser/issues/295)) ([195bc4a](https://www.github.com/yargs/yargs-parser/commit/195bc4a7f20c2a8f8e33fbb6ba96ef6e9a0120a1))
* expose camelCase and decamelize helpers ([#296](https://www.github.com/yargs/yargs-parser/issues/296)) ([39154ce](https://www.github.com/yargs/yargs-parser/commit/39154ceb5bdcf76b5f59a9219b34cedb79b67f26))
* **deps:** update to latest camelcase/decamelize ([#281](https://www.github.com/yargs/yargs-parser/issues/281)) ([8931ab0](https://www.github.com/yargs/yargs-parser/commit/8931ab08f686cc55286f33a95a83537da2be5516))


### Bug Fixes

* boolean numeric short option ([#294](https://www.github.com/yargs/yargs-parser/issues/294)) ([f600082](https://www.github.com/yargs/yargs-parser/commit/f600082c959e092076caf420bbbc9d7a231e2418))
* raise permission error for Deno if config load fails ([#298](https://www.github.com/yargs/yargs-parser/issues/298)) ([1174e2b](https://www.github.com/yargs/yargs-parser/commit/1174e2b3f0c845a1cd64e14ffc3703e730567a84))
* **deps:** update dependency decamelize to v3 ([#274](https://www.github.com/yargs/yargs-parser/issues/274)) ([4d98698](https://www.github.com/yargs/yargs-parser/commit/4d98698bc6767e84ec54a0842908191739be73b7))
* **types:** switch back to using Partial types ([#293](https://www.github.com/yargs/yargs-parser/issues/293)) ([bdc80ba](https://www.github.com/yargs/yargs-parser/commit/bdc80ba59fa13bc3025ce0a85e8bad9f9da24ea7))


### Build System

* drops Node 6. begin following Node.js LTS schedule ([#278](https://www.github.com/yargs/yargs-parser/issues/278)) ([9014ed7](https://www.github.com/yargs/yargs-parser/commit/9014ed722a32768b96b829e65a31705db5c1458a))


### Code Refactoring

* **ts:** move index.js to TypeScript ([#292](https://www.github.com/yargs/yargs-parser/issues/292)) ([f78d2b9](https://www.github.com/yargs/yargs-parser/commit/f78d2b97567ac4828624406e420b4047c710b789))

### [18.1.3](https://www.github.com/yargs/yargs-parser/compare/v18.1.2...v18.1.3) (2020-04-16)


### Bug Fixes

* **setArg:** options using camel-case and dot-notation populated twice ([#268](https://www.github.com/yargs/yargs-parser/issues/268)) ([f7e15b9](https://www.github.com/yargs/yargs-parser/commit/f7e15b9800900b9856acac1a830a5f35847be73e))

### [18.1.2](https://www.github.com/yargs/yargs-parser/compare/v18.1.1...v18.1.2) (2020-03-26)


### Bug Fixes

* **array, nargs:** support -o=--value and --option=--value format ([#262](https://www.github.com/yargs/yargs-parser/issues/262)) ([41d3f81](https://www.github.com/yargs/yargs-parser/commit/41d3f8139e116706b28de9b0de3433feb08d2f13))

### [18.1.1](https://www.github.com/yargs/yargs-parser/compare/v18.1.0...v18.1.1) (2020-03-16)


### Bug Fixes

* \_\_proto\_\_ will now be replaced with \_\_\_proto\_\_\_ in parse ([#258](https://www.github.com/yargs/yargs-parser/issues/258)), patching a potential 
prototype pollution vulnerability. This was reported by the Snyk Security Research Team.([63810ca](https://www.github.com/yargs/yargs-parser/commit/63810ca1ae1a24b08293a4d971e70e058c7a41e2))

## [18.1.0](https://www.github.com/yargs/yargs-parser/compare/v18.0.0...v18.1.0) (2020-03-07)


### Features

* introduce single-digit boolean aliases ([#255](https://www.github.com/yargs/yargs-parser/issues/255)) ([9c60265](https://www.github.com/yargs/yargs-parser/commit/9c60265fd7a03cb98e6df3e32c8c5e7508d9f56f))

## [18.0.0](https://www.github.com/yargs/yargs-parser/compare/v17.1.0...v18.0.0) (2020-03-02)


### ⚠ BREAKING CHANGES

* the narg count is now enforced when parsing arrays.

### Features

* NaN can now be provided as a value for nargs, indicating "at least" one value is expected for array ([#251](https://www.github.com/yargs/yargs-parser/issues/251)) ([9db4be8](https://www.github.com/yargs/yargs-parser/commit/9db4be81417a2c7097128db34d86fe70ef4af70c))

## [17.1.0](https://www.github.com/yargs/yargs-parser/compare/v17.0.1...v17.1.0) (2020-03-01)


### Features

* introduce greedy-arrays config, for specifying whether arrays consume multiple positionals ([#249](https://www.github.com/yargs/yargs-parser/issues/249)) ([60e880a](https://www.github.com/yargs/yargs-parser/commit/60e880a837046314d89fa4725f923837fd33a9eb))

### [17.0.1](https://www.github.com/yargs/yargs-parser/compare/v17.0.0...v17.0.1) (2020-02-29)


### Bug Fixes

* normalized keys were not enumerable ([#247](https://www.github.com/yargs/yargs-parser/issues/247)) ([57119f9](https://www.github.com/yargs/yargs-parser/commit/57119f9f17cf27499bd95e61c2f72d18314f11ba))

## [17.0.0](https://www.github.com/yargs/yargs-parser/compare/v16.1.0...v17.0.0) (2020-02-10)


### ⚠ BREAKING CHANGES

* this reverts parsing behavior of booleans to that of yargs@14
* objects used during parsing are now created with a null
prototype. There may be some scenarios where this change in behavior
leaks externally.

### Features

* boolean arguments will not be collected into an implicit array ([#236](https://www.github.com/yargs/yargs-parser/issues/236)) ([34c4e19](https://www.github.com/yargs/yargs-parser/commit/34c4e19bae4e7af63e3cb6fa654a97ed476e5eb5))
* introduce nargs-eats-options config option ([#246](https://www.github.com/yargs/yargs-parser/issues/246)) ([d50822a](https://www.github.com/yargs/yargs-parser/commit/d50822ac10e1b05f2e9643671ca131ac251b6732))


### Bug Fixes

* address bugs with "uknown-options-as-args" ([bc023e3](https://www.github.com/yargs/yargs-parser/commit/bc023e3b13e20a118353f9507d1c999bf388a346))
* array should take precedence over nargs, but enforce nargs ([#243](https://www.github.com/yargs/yargs-parser/issues/243)) ([4cbc188](https://www.github.com/yargs/yargs-parser/commit/4cbc188b7abb2249529a19c090338debdad2fe6c))
* support keys that collide with object prototypes ([#234](https://www.github.com/yargs/yargs-parser/issues/234)) ([1587b6d](https://www.github.com/yargs/yargs-parser/commit/1587b6d91db853a9109f1be6b209077993fee4de))
* unknown options terminated with digits now handled by unknown-options-as-args ([#238](https://www.github.com/yargs/yargs-parser/issues/238)) ([d36cdfa](https://www.github.com/yargs/yargs-parser/commit/d36cdfa854254d7c7e0fe1d583818332ac46c2a5))

## [16.1.0](https://www.github.com/yargs/yargs-parser/compare/v16.0.0...v16.1.0) (2019-11-01)


### ⚠ BREAKING CHANGES

* populate error if incompatible narg/count or array/count options are used (#191)

### Features

* options that have had their default value used are now tracked ([#211](https://www.github.com/yargs/yargs-parser/issues/211)) ([a525234](https://www.github.com/yargs/yargs-parser/commit/a525234558c847deedd73f8792e0a3b77b26e2c0))
* populate error if incompatible narg/count or array/count options are used ([#191](https://www.github.com/yargs/yargs-parser/issues/191)) ([84a401f](https://www.github.com/yargs/yargs-parser/commit/84a401f0fa3095e0a19661670d1570d0c3b9d3c9))


### Reverts

* revert 16.0.0 CHANGELOG entry ([920320a](https://www.github.com/yargs/yargs-parser/commit/920320ad9861bbfd58eda39221ae211540fc1daf))
