December 2020 (version 1.44.0)

Welcome to the new DeepScan updates. 2020 has been a very hard year and here we hope you are staying healthy and safe and we'll see you next in 2021.

Thank you for your continual love and support!

New Rules

The following rules are introduced:

BAD_MATCH_ALL_ARG - Do not use a non-global RegExp argument for String.prototype.matchAll()
BAD_MONTH_ARG - Do not use 12 as the month argument of Date methods
MISPLACED_ALTERNATIVE_IN_REGEXP - Do not use incorrect order of alternatives in the regular expression

Support ES2020 globalThis
Support ES2020 String.prototype.matchAll()
Support ES2020 Promise.allSettled()
Support TypeScript ambient class/function merging
Support TypeScript type annotation at catch clause binding
Support TypeScript labeled tuple element
Support spreading types anywhere inside TypeScript tuple
Support as clause at TypeScript mapped type
Support paths config without baseUrl in TypeScript tsconfig.json
Improve recognizing React JSX expressions to handle the new JSX transform of React 17
Detect BAD_TYPE_COERCION alarm when objects are converted to numbers at binary -, *, /, %, or ** operator
Detect BAD_TYPE_COERCION alarm when non-numeric strings are converted to number at unary + or - operator
Restrict BAD_TYPE_COERCION detection on object values at comparison operators to the case that the other operand is a number

Defect merging does not work when the code fragment contains CR in it(\r)
A false alarm for SYNTAX_ERROR occurs when an optional binding pattern is used in TypeScript ambient contexts
A false alarm for SYNTAX_ERROR occurs for TypeScript optional async method
Syntax errors may not be reported for incorrectly placed TypeScript type annotations