Additional Examples

Metadata

You may want to pass dictionaries as arguments to your Cadence code. The most common is metadata with \{String:String\} type

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import {executeScript} from "@onflow/flow-js-testing"

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const main = async () => {

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const basePath = path.resolve(__dirname, "../cadence")

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// Init framework

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await init(basePath)

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// Start emulator

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await emulator.start()

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const code = `

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access(all) fun main(metadata: {String: String}): String{

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return metadata["name"]!

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}

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`

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// Define arguments we want to pass

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const args = [{name: "Boris", nickname: "The Blade"}]

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// If something goes wrong with script execution, the method will throw an error

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// so we need to catch it and proce

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const [name, err] = await shallResolve(executeScript({code, args}))

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console.log(name, err)

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await emulator.stop()

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}

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main()

If you need to pass an array of dictionaries, it's not that different. Just replace the args variable above with multiple values:

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const args = [

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// This is array of dictionaries

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[

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{name: "Boris", nickname: "The Blade"},

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{name: "Franky", nickname: "Four-Fingers"},

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],

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]

Or maybe you want to pass dictionary with type {String: [String]}:

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const args = [

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{

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names: ["Alice", "Bob", "Charlie"],

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},

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]

Framework will try to resolve the types to the best of its abilities. If you encounter an error for your use case, please create an issue here: https://github.com/onflow/flow-js-testing/issues