Practical Type Operations of TypeScript

I often use

Overload

Moment

React

Generic

Like parameters of type ?

Constraints

Constraints

Index

Interface

Mapped Types

Conditional Type

Type Utilities

https://www.typescriptlang.org/docs/handbook/utility-types.html

Partial<T>

Required<T>

Readonly<T>

NonNullable<T>

ReturnType<T>

Parameters<T>

Record<Keys, Type>

Exclude<Type, Other>

Extract<Type, Other>

Pick<Keys, Type>

Omit<Keys, Type>

Infer

Example 1

Get event type by corresponding handler name

Get event handlers

Get event handler by name

Get event by name

Example 2

From LeetCode frontend JD

https://github.com/LeetCode-OpenSource/hire/blob/master/typescript_zh.md

Only pick functions

Extract promise & action

Combine extractors

Template literal types

Key Augment

v4.1

2020-11-17

https://github.com/microsoft/TypeScript/pull/40336

https://www.typescriptlang.org/play?ts=4.1.0-dev.20200920#code/C4TwDgpgBAymA2BLYAeGUIA9gQHYBMBnKQ4AJ0VwHMAaKAEQ2zyJPMqoD4oBeWJnAWIADACQBvSgDMIZKABUAvhPrLJuGXICqi4VAD8UANry6AOgtwkqLXXqcAulABcxmA4DcAKFCQFAQwBrCAAZf1IUADVuPkiBFmIjJ0NcCAA3WRcoOKxBViNSCmpk7KMABidXHOYhY0KOcwtpTIAlEvkg0PDUFu5XVIyyb19oeQoAWxCIKVRqvOJ66hjs+Nq9CWa5Ft0DBQmpmZRerMjh8FGJlsQqAAtZ1dZFrl4V3ISoMXVNKG2P3bHEOMrrcen1smc-ADxlEHgt2EsXlCDqgocC7lFOJwIdAYOwwABZAD2+EQUkQshhb1qTzo+NhbCKz1i9M+mygITU+LUbIAgjtDCETtjYHiiSSybJCJSao94UyRRQCcTSeSyGhRcqJWrcYqxSqKTrEErxaqonQAORmc2cC0AYmtFqMDqg5uc1uFHWCYVIPJmsnkhOCuGl8wZDQU9Key0Nxv1ZClnq6ESsyBQUIxdHkmKxPnOUAA4hBgN7gABReAQcZ4YAAOX8VZD7yjiM6Jd9ODIAaDadb3Xb-sDeDNLpdNtH7tzfkLZf8AGMbuXK9W6w3InRBVTZYyki8kssvFBD68ZYknAejxeBVBzxfD1V6QU5Wfb0fDEYLGYQnRpyXF1XcLW9YQFE5QOI414vnex6ho+jKNGYbJtBBkGGNOpZzguFb-oBDYtHQ74WF+BZFr+WHLkBIEVI43A3rerhJMKaFkQBK4QFKcxNnKyxoRhf7kQ2KazBaNDWjmIxQHxAEAEIgKxjbUlxLy0RxtTBCAhJSFAAAS8j4iEknAB0VCsfi-hgMhL6GDpekGUZJlmUYkTPpB96bsQakabAkT5rZ-jGUBpnmbRl5eT5zGGX59lgI5zkvq4BnCqZwDzuhKXhcOG4nhJ4VQAAPlAuAAK7wPALxFSV+4Xip+SxbeV7BUerlZbBHC1SFgr5QZMlyZEoE0ZBJwPjSUAfohbWvlASUpbx6V4eyeXZUu0myRRvVUf1Lnst4k7QAAioVsggC0bHFSikaKXwU0LjNS2oExt2sQmmLbQA9AAVG9B5vRJmD1ggEBfS9Xj4BAs7wP4ZDQFIhW4LOwCIISuBQAAjgdZAgDAEAVnDhJqvI52MpwAAUqOHa48gAJSuPth3HYQp1pjmXizojpBQP4Lyk+jmPY8AuNE+aJJpGYABG-i4KkcjcP4Zizv4JUALR8wrc7w4j5oU1AL0vQr3DWSEPKwzcuMGczrPAFAIuc2jGNY6DfNkALlBgIVwB0ELGtazreu6SEACSuAu2WOX5fr9CIGkpss7gbOztbh08-b-PmrOiBkGDEBGLOmA8AARAAjAArGUucOJ72u66FADCacZ1H5tQPg8fc3bOOO+aIuu3zuC2p3IAK7ghIAO7l972m+1JXeI-XMcW9AfBc7bvPJ4Q9sI0jYDOGS8bAArGlK+cGseF7lf6wAChDflkGZmG3V4QA

References

https://www.typescriptlang.org/

https://github.com/LeetCode-OpenSource/hire/blob/master/typescript_zh.md

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Practical Type Operations of TypeScript - I often use

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