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Sven Slootweg 11 months ago
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.gitignore View File

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node_modules

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README.md View File

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# @validatem/either
Documentation for this module has not been written yet. By the time it reaches 1.0.0, it will have full documentation.
In the meantime, check out the `example.js` file in the repository for a usage demonstration.

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example.js View File

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"use strict";
const { validateValue } = require("@validatem/core");
const isNumber = require("@validatem/is-number");
const isString = require("@validatem/is-string");
const either = require("./");
let rule = either([ isNumber, isString ]);
console.log(validateValue("hello world", [ rule ])); // hello world
console.log(validateValue(42, [ rule ])); // 42
console.log(validateValue(true, [ rule ])); /*
AggregrateValidationError: One or more validation errors occurred:
- At (root): Must satisfy at least one of: "Must be a number", "Must be a string"
*/

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index.js View File

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"use strict";
// TODO: Rename this to something more appropriate, like any/anyOf? How to make sure that doesn't cause confusion with `oneOf`?
const ValidationError = require("@validatem/error");
const combinator = require("@validatem/combinator");
module.exports = function (alternatives) {
if (!Array.isArray(alternatives)) {
throw new Error(`Must specify an array of alternatives`);
} else if (alternatives.length < 2) {
// This doesn't interfere with conditionally-specified alternatives using ternary expressions, because in those cases there is still *some* item specified, it's just going to have a value of `undefined` (and will subsequently be filtered out)
throw new Error("Must specify at least two alternatives");
} else if (arguments.length > 1) {
throw new Error(`Only one argument is accepted; maybe you forgot to wrap the different alternatives into an array?`);
} else {
return combinator((value, applyValidators) => {
let allErrors = [];
for (let alternative of alternatives) {
let { errors, newValue } = applyValidators(value, alternative);
if (errors.length === 0) {
return newValue;
} else {
allErrors.push(...errors);
}
}
let errorList = allErrors
.map((error) => {
return `"${error.message}"`;
})
.join(", ");
throw new ValidationError(`Must satisfy at least one of: ${errorList}`, { errors: allErrors });
});
}
};

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package.json View File

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{
"name": "@validatem/either",
"description": "Validatem combinator for specifying 'alternatives', and verifying that a value meets at least one of the rules",
"keywords": [
"validatem",
"validator",
"combinator"
],
"version": "0.1.0",
"main": "index.js",
"repository": "http://git.cryto.net/validatem/either.git",
"author": "Sven Slootweg <admin@cryto.net>",
"license": "WTFPL OR CC0-1.0",
"devDependencies": {
"@validatem/core": "^0.3.1",
"@validatem/is-number": "^0.1.2",
"@validatem/is-string": "^0.1.1"
},
"dependencies": {
"@validatem/combinator": "^0.1.1",
"@validatem/error": "^1.0.0"
}
}

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yarn.lock View File

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