[TypeScript] Collect Related Strings in a String Enum in TypeScript
2021-06-28 23:06
标签：type const compile reserve values turn appear name number As of TypeScript 2.4, it is now possible to define string enums, or more precisely, enums with string members. Just like any other numeric enum, string enums can be made constant using the For example,we have the code: We want to replace ‘application/json‘ to use Typescript enum. From the compiled code, we can see the output: The compile code, it add a IIFE define and set JSON code to ‘application/json‘. Sometime, we don‘t want this meta code goes into production code, the way to do this is add "const": As we can see, the output code doesn‘t have IIFE anymore, the code is much smaller. You can get reverse mapping by using number: Last thing, if you really want to use "const" keyword but still want to keep IIFE meta code, you can set up in tsconfig.json: [TypeScript] Collect Related Strings in a String Enum in TypeScript 标签：type const compile reserve values turn appear name number 原文地址：https://www.cnblogs.com/Answer1215/p/7801172.htmlconst modifier so that they disappear entirely from the generated JavaScript; in this case, all enum values will be inlined into the output.fetch("https://swapi.co/api/people/1/", {
headers: {
Accept: ‘application/json‘
}
})
.then((res) => res.json())
.then(response => {
console.log(response.name)
});
enum MediaTypes {
JSON = "application/json"
}
fetch("https://swapi.co/api/people/1/", {
headers: {
Accept: MediaTypes.JSON
}
})
.then((res) => res.json())
.then(response => {
console.log(response.name)
});
var MediaTypes;
(function (MediaTypes) {
MediaTypes["JSON"] = "application/json";
})(MediaTypes || (MediaTypes = {}));
fetch("https://swapi.co/api/people/1/", {
headers: {
Accept: MediaTypes.JSON
}
})
.then(function (res) { return res.json(); })
.then(function (response) {
console.log(response.name);
});
const enum MediaTypes {
JSON = "application/json"
}
/*compiled code**/
fetch("https://swapi.co/api/people/1/", {
headers: {
Accept: "application/json" /* JSON */
}
})
.then(function (res) { return res.json(); })
.then(function (response) {
console.log(response.name);
});
enum Port {
NUM = 412
}
/**compiled code*/
(function (Port) {
Port[Port["NUM"] = 412] = "NUM";
})(Port || (Port = {}));
{
"preserveConstEnums": true
}
文章标题：[TypeScript] Collect Related Strings in a String Enum in TypeScript
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