chore: release 15.2.0

[github-actions]

🤖 I have created a release *beep* *boop*

15.2.0 (2021-01-11)

⚠ BREAKING CHANGES

• feat!: improve support for async/await yargs/yargs#1823 contains the following breaking API changes:
  • now returns a promise if handler is async.
  • onFinishCommand removed, in favor of being able to await promise.
  • getCompletion now invokes callback with err and `completions, returns promise of completions.
• tweaks to ESM/Deno API surface: now exports yargs function by default; getProcessArgvWithoutBin becomes hidBin; types now exported for Deno.
• find-up replaced with escalade; export map added (limits importable files in Node >= 12); yarser-parser@19.x.x (new decamelize/camelcase implementation).
• usage: single character aliases are now shown first in help output
• ts: yargs now ships with its own types
• drop support for EOL Node 8 (feat!: drop support for EOL Node 8 yargs/yargs#1686)
• deps: yargs-parser@17.0.0 no longer implicitly creates arrays out of boolean arguments when duplicates are provided
• deps: yargs-parser now throws on invalid combinations of config (feat(deps)!: yargs-parser@16.0.0 now throws on invalid combinations of config yargs/yargs#1470)
• yargs-parser@16.0.0 drops support for Node 6
• drop Node 6 support (chore!: drop Node 6 support yargs/yargs#1461)
• remove package.json-based parserConfiguration (refactor!: remove package.json-based parserConfiguration yargs/yargs#1460)
• previously to this fix methods like yargs.getOptions() contained the state of the last command to execute.
• do not allow additional positionals in strict mode
• options with leading '+' or '0' now parse as strings
• dropping Node 6 which hits end of life in April 2019
• see yargs-parser@12.0.0 CHANGELOG
• we now warn if the yargs stanza package.json is used.
• Options absent from argv (not set via CLI argument) are now absent from the parsed result object rather tahn being set with undefined
• drop Node 6 from testing matrix, such that we'll gradually start drifting away from supporting Node 4.
• yargs-parser does not populate 'false' when boolean flag is not passed
• tests that assert against help output will need to be updated
• requiresArg now has significantly different error output, matching nargs.
• .usage() no longer accepts an options object as the second argument. It can instead be used as an alias for configuring a default command.
• previously hidden options were simply implied using a falsy description
• help command now only executes if it's the last positional in argv._
• version() and help() are now enabled by default, and show up in help output; the implicit help command can no longer be enabled/disabled independently from the help command itself (which can now be disabled).
• environment variables will now override config files, '--' is now populated rather than '_' when parsing is stopped.
• extends functionality now always loads the JSON provided, rather than reading from a specific key
• this pull requests introduces language features that require Node 4+.
• the first argument to strict() is now used to enable/disable its functionality, rather than controlling whether or not it is global.
• extends key in config file is now used for extending other config files
• environment variables now take precedence over config files.
• context now takes precedence over argv and defaults
• there's a good chance this will throw exceptions for a few folks who are using the API in an unexpected way.
• by default options, and many of yargs' parsing helpers will now default to being applied globally; such that they are no-longer reset before being passed into commands.
• yargs will no longer aggressively supress errors, allowing errors that are not generated internally to bubble.

Features

• .usage() can now be used to configure a default command (#975) (7269531)
• Add .parserConfiguration() method, deprecating package.json config (#1262) (3c6869a)
• add applyBeforeValidation, for applying sync middleware before validation (5be206a)
• add conflicts and implies shorthands. (#753) (bd1472b)
• add missing simple chinese locale strings (#1004) (3cc24ec)
• add new pt_BR translations (#674) (5615a82)
• add Norwegian Nynorsk translations (#1028) (a5ac213)
• add support for global middleware, useful for shared tasks like metrics (#1119) (9d71ac7)
• add support for numeric commands (#825) (fde0564)
• add traditional Chinese translation (#780) (6ab6a95)
• add usage for single-digit boolean aliases (#1580) (6014e39)
• adds config option for sorting command output (#1256) (6916ce9)
• adds deprecation option for commands (027a636)
• adds strictOptions() (#1738) (b215fba)
• adds support for ESM and Deno (#1708) (ac6d5d1)
• adds support for multiple epilog messages (#1384) (07a5554)
• allow completionCommand to be set via showCompletionScript (#1385) (5562853)
• allow extends to inherit from a module (#865) (89456d9)
• allow hidden options to be displayed with --show-hidden (#1061) (ea862ae)
• allow implies and conflicts to accept array values (#922) (abdc7da)
• allow parse with no arguments as alias for yargs.argv (#944) (a9f03e7)
• allow provided config object to extend other configs (#779) (3280dd0)
• allow setting scriptName $0 (#1143) (a2f2eae)
• allow strict mode to be disabled (#840) (6f78c05)
• async command handlers (#1001) (241124b)
• command() now accepts an array of modules (f415388)
• command: add camelcase commands to argv (#658) (b1cabae)
• complete short options with a single dash (#1507) (99011ab)
• completion: takes negated flags into account when boolean-negation is set (#1509) (7293ad5)
• deprecateOption (#1559) (8aae333)
• deps: introduce yargs-parser with support for unknown-options-as-args (#1440) (4d21520)
• deps: pull in yargs-parser@17.0.0 (#1553) (b9409da)
• deps: yargs-parser now throws on invalid combinations of config (#1470) (c10c38c)
• deps: yargs-parser with 'greedy-array' configuration (#1569) (a03a320)
• deps: yargs-parser with support for collect-unknown-options (#1421) (d388a7c)
• display appropriate $0 for electron apps (#1536) (d0e4379)
• drop support for EOL Node 8 (#1686) (863937f)
• enable .help() and .version() by default (#912) (1ef44e0)
• expose Parser from require('yargs/yargs') (#1477) (1840ba2)
• expose hideBin helper for CJS (#1768) (63e1173)
• extend *.rc files in addition to json (#1080) (11691a6)
• function argument validation (#773) (22ed9bb)
• helpers: rebase, Parser, applyExtends now blessed helpers (#1733) (c7debe8)
• hidden options are now explicitly indicated using "hidden" flag (#962) (280d0d6)
• i18n for ESM and Deno (#1735) (c71783a)
• i18n: swap out os-locale dependency for simple inline implementation (#1356) (4dfa19b)
• if only one column is provided for examples, allow it to take up the entire line (#749) (7931652)
• implement conflicts() for defining mutually exclusive arguments; thanks @madcampos! (#741) (5883779)
• improve support for async/await (#1823) (169b815)
• initial support for command aliases (#647) (127a040)
• introduce .positional() for configuring positional arguments (#967) (cb16460)
• introduce custom yargs error object (#765) (8308efa)
• introduces strictCommands() subset of strict mode (#1540) (1d4cca3)
• introduces support for default commands, using the '*' identifier (#785) (d78a0f5)
• Italian translations for 'did you mean' and 'aliases' (#673) (81984e6)
• lang: add Finnish localization (language code fi) (222c8fe)
• locales: add Hindi translations (9290912)
• locales: add Hungarian translations (be92327)
• locales: Add Thai locale file (#679) (c05e36b)
• locales: Added Belarusian translation (#690) (68dac1f)
• locales: Create nl.json (#687) (46ce1bb)
• locales: Japanese translations for 'did you mean' and 'aliases' (#651) (5eb78fc)
• locales: Polish translations for 'did you mean' and 'aliases' (#650) (c951c0e)
• make it possible to merge configurations when extending other config. (#1411) (5d7ad98)
• middleware (#881) (77b8dbc)
• multiple usage calls are now collected, not replaced (#958) (74a38b2)
• onFinishCommand handler (#1473) (fe380cd)
• options/positionals with leading '+' and '0' no longer parse as numbers (#1286) (e9dc3aa)
• pull in yargs-parser introducing additional settings (#688), and fixing #716 (#722) (702995a)
• remove setPlaceholderKeys (#1105) (6ee2c82)
• replace /bin/bash with file basename (#983) (20bb99b)
• requiresArg is now simply an alias for nargs(1) (#1054) (a3ddacc)
• rethink how options are inherited by commands (#766) (ab1fa4b)
• reworking yargs API to make it easier to run in headless environments, e.g., Slack (#646) (f284c29)
• split demand() into demandCommand()/demandOption() (#740) (66573c8)
• support array of examples (#1682) (225ab82)
• support defaultDescription for positional arguments (812048c)
• support for positional argument aliases (#727) (27e1a57)
• support promises in middleware (f3a4e4f)
• to allow both undefined and nulls, for benefit of TypeScript (#945) (792564d)
• translation: Update pl-PL translations (#985) (5a9c986)
• Turkish translations for 'did you mean' and 'aliases' (#660) (072fd45)
• tweaks to API surface based on user feedback (#1726) (4151fee)
• update to yargs-parser that addresses #598, #617 (#700) (54cb31d)
• usage: single char aliases first in help (#1574) (a552990)
• yargs is now passed as the third-argument to fail handler (#613) (21b74f9)
• yargs-parser: introduce single-digit boolean aliases (#1576) (3af7f04)
• zsh auto completion (#1292) (16c5d25), closes #1156

Bug Fixes

• proto will now be replaced with proto in parse (#1591) (2474c38)
• --help with default command should print top-level help (#810) (9c03fa4)
• .argv and .parse() now invoke identical code path (#1126) (f13ebf4)
• 'undefined' default value for choices resulted in validation failing (782b896)
• 'undefined' should be taken to mean no argument was provided (#1015) (c679e90)
• [object Object] was accidentally being populated on options object (#736) (f755e27)
• $0 contains first arg in bundled electron apps (#1206) (567820b)
• accept single function for middleware (66fd6f7)
• Add dirname sanity check on findUp (#1036) (331d103)
• add package.json to module exports (#1818) (d783a49), closes #1817
• add zsh script to files array (3180224)
• address ambiguity between nargs of 1 and requiresArg (#1572) (a5edc32)
• address bug with handling of arrays of implications (c240661)
• address issues with dutch translation (#1316) (0295132)
• address min/max validation message regression (#750) (2e5ce0f)
• address positional argument strict() bug introduced in #766 (#784) (a8528e6)
• allows camel-case, variadic arguments, and strict mode to be combined (#1247) (eacc035)
• async middleware was called twice (#1422) (9a42b63)
• better bash path completion (#1272) (da75ea2)
• calling parse multiple times now appropriately maintains state (#1137) (#1369) (026b151)
• choose correct config directory when require.main does not exist (#1056) (a04678c)
• code was not passed to process.exit (#1742) (d1a9930)
• command: Run default cmd even if the only cmd (#950) (7b22203)
• commands are now applied in order, from left to right (#857) (baba863)
• command: subcommands via commandDir() now supported for parse(msg, cb) (#678) (6b85cc6)
• completion: Avoid default command and recommendations during completion (#1123) (036e7c5)
• config and normalise can be disabled with false (#952) (3bb8771)
• console.warn() rather than throwing errors when api signatures are incorrect (#804) (a607061)
• context should override parsed argv (#786) (0997288)
• context variables are now recognized in strict() mode (#796) (48575cd)
• defaulting keys to 'undefined' interfered with conflicting key logic (a8e0cff)
• deno: get yargs working on deno@1.5.x (#1799) (cb01c98)
• deno: update types for deno ^1.4.0 (#1772) (0801752)
• dependencies: upgrade yargs-parser to fix #1602 (#1603) (c67c257)
• deps: cliui, find-up, and string-width, all drop Node 6 support (#1479) (6a9ebe2)
• deps: fix enumeration for normalized path arguments (#1567) (0b5b1b0)
• deps: Update os-locale to avoid security vulnerability (#1270) (27bf739)
• deps: upgrade cliui for compatibility with latest chalk. (#1330) (b20db65)
• deps: use decamelize from npm instead of vendored copy (#1377) (015eeb9)
• deps: yargs-parser update addressing several parsing bugs (#1357) (e230d5b)
• detect zsh when zsh isnt run as a login prompt (#1395) (8792d13)
• do not allow additional positionals in strict mode (35d777c)
• do not use cwd when resolving package.json for yargs parsing config (#726) (9bdaab7)
• docs: broken markdown link (#1426) (236e24e)
• docs: describe usage of .check() in more detail (932cd11)
• docs: fix incorrect parserConfiguration documentation (2a99124)
• docs: formalize existing callback argument to showHelp (#1386) (d217764)
• docs: TypeScript import to prevent a future major release warning (#1441) (b1b156a)
• docs: update boolean description and examples in docs (#1474) (afd5b48)
• docs: use recommended cjs import syntax for ts examples (#1513) (f9a18bf)
• don't bother calling JSON.stringify() on string default values (#891) (628be21)
• don't load config when processing positionals (5d0dc92)
• errors were not bubbling appropriately from sub-commands to top-level (#802) (8a992f5)
• examples: fix usage-options.js to reflect current API (#1375) (6e5b76b)
• exclude positional arguments from completion output (#927) (71c7ec7)
• exports: node 13.0-13.6 require a string fallback (#1776) (b45c43a)
• expose helpers for legacy versions of Node.js (#1801) (107deaa)
• fix demandOption no longer treats 'false' as truthy (#829) (c748dd2)
• fix promise check to accept any spec conform object (#1424) (0be43d2)
• fix tiny spacing issue with usage (#992) (7871327)
• freeze was not resetting configObjects to initial state; addressed performance issue raised by @nexdrew. (#670) (ae4bcd4)
• get terminalWidth in non interactive mode no longer causes a validation exception (#837) (360e301)
• getCompletion() was not working for options (#1495) (463feb2)
• groups were not being maintained for nested commands (#1430) (d38650e)
• help always displayed for the first command parsed having an async handler (#1535) (d585b30)
• help now takes precedence over command recommendation (#866) (17e3567)
• help strings for nested commands were missing parent commands (#990) (cd1ca15)
• hide hidden options from help output even if they are in a group (#1221) (da54028)
• i18n: Japanese translation phrasing (#1619) (0894175)
• i18n: rename unclear 'implication failed' to 'missing dependent arguments' (#1317) (bf46813)
• implications fails only displayed once (#954) (ac8088b)
• improve Norwegian Bokmål translations (#1208) (a458fa4)
• improve Norwegian Nynorsk translations (#1207) (d422eb5)
• less eager help command execution (#972) (8c1d7bf)
• locales: change some translations (#667) (aa966c5)
• locales: conform hi locale to y18n.__n expectations (#666) (22adb18)
• locales: correct some Russian translations (#691) (a980671)
• locales: only translate default option group name (acc16de)
• locales: remove extra space in French for 'default' (#1564) (ecfc2c4)
• make positionals in -- count towards validation (#1752) (eb2b29d)
• middleware added multiple times due to reference bug (#1282) (64af518)
• middleware should work regardless of when method is called (664b265), closes #1178
• misspelling of package.json engines field (0891d0e)
• modules: module path was incorrect (#1759) (95a4a0a)
• move yargs.cjs to yargs to fix Node 10 imports (#1747) (5bfb85b)
• parse array rather than string, so that quotes are safe (#993) (c351685)
• populate correct value on yargs.parsed and stop warning on access (#1412) (bb0eb52)
• populate positionals when unknown-options-as-args is set (#1508) (bb0f2eb), closes #1444
• populating placeholder arguments broke validation (b3eb2fe)
• positional arguments now work if no handler is provided to inner command (#864) (e28ded3)
• positional arguments of sub-commands threw strict() exception (#805) (f3f074b)
• positional: positional strings no longer drop decimals (#1761) (e1a300f)
• prefer user supplied script name in usage (#1383) (28c74b9)
• properties accessed on singleton now reflect current state of instance (#1366) (409d35b)
• pull in yargs-parser with modified env precedence (#787) (e0fbbe5)
• remove the trailing white spaces from the help output (#1090) (3f0746c)
• requiresArg should only be enforced if argument exists (#1043) (fbf41ae)
• running parse() multiple times on the same yargs instance caused exception if help() enabled (#790) (07e39b7)
• Set implicit nargs=1 when type=number requiresArg=true (#1050) (2b56812)
• show 2 dashes on help for single digit option key or alias (#1493) (63b3dd3)
• showCompletionScript was logging script twice (#1388) (07c8537)
• still freeze/unfreeze if parse() is called in isolation (#717) (30a9492)
• stop applying parser to context object (#675) (3fe9b8f)
• stop-parse was not being respected by commands (#1459) (12c82e6)
• strict mode should not fail for hidden options (#949) (0e0c58d)
• strict mode: report default command unknown arguments (#1626) (69f29a9)
• strict() should not ignore hyphenated arguments (#1414) (b774b5e)
• support merging deeply nested configuration (#1423) (bae66fe)
• support options/sub-commands in zsh completion (0a96394)
• temporary fix for libraries that call Object.freeze() (#1483) (99c2dc8)
• the positional argument parse was clobbering global flag arguments (#984) (7e58453)
• tolerate null prototype for config objects with extends (#1376) (3d26d11), closes #1372
• translation not working when using __ with a single parameter (#1183) (f449aea)
• translations: add French translation for unknown command (#1563) (18b0b75)
• translations: fix pluralization in error messages. (#1557) (94fa38c)
• typescript: yargs-parser was breaking @types/yargs (#1745) (2253284)
• update to yargs-parser with fix for array default values (#1463) (ebee59d)
• upgrade os-locale to version that addresses license issue (#1195) (efc0970)
• usage: translate 'options' group only when displaying help (#1600) (e60b39b)
• use correct completion command in generated completion script (#988) (3c8ac1d)
• use path.resolve() to support node 0.10 (#797) (49a93fc)
• validation: Use the error as a message when none exists otherwise (#1268) (0510fe6)
• we shouldn't output help if we've printed a prior help-like message (#847) (17e89bd)
• yargs: add missing command(module) signature (#1707) (0f81024), closes #1704
• yargs: correct support of bundled electron apps (#1554) (a0b61ac)

Performance Improvements

• normalizing package data is an expensive operation (#705) (49cf533)

Miscellaneous Chores

• drop Node 6 from testing matrix (#1287) (ef16792)
• drop Node 6 support (#1461) (2ba8ce0)
• test Node.js 6, 8 and 10 (#1160) (84f9d2b)
• update dependencies (#1284) (f25de4f)
• upgrade to version of yargs-parser that does not populate value for unset boolean (#1104) (d4705f4)
• upgrade yargs-parser (#867) (8f9c6c6)

Code Refactoring

• remove package.json-based parserConfiguration (#1460) (0d3642b)
• ts: ship yargs.d.ts (#1671) (c06f886)

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