fix noImplicitOverride error

add-override.js

const cp = require("child_process")
const fs = require("fs/promises")
const path = require("path")
try {
    cp.execSync("npx tsc --noEmit")
} catch (e) {
    const output = e.stdout.toString()
    const regexp = /^(.+\.ts)\((\d+?),(\d+?)\): error TS411(4|6):.+/
    const overrideFiles = output.split("\n").reduce((m, line) => {
        const result = line.match(regexp)
        if (result) {
            const [, filePath, row, col] = result
            if (!m.has(filePath)) {
                m.set(filePath, [])
            }
            const poss = m.get(filePath)
            poss.push({row, col})
            poss.sort(({row: r1}, {row: r2}) => r1 - r2)
        }
        return m
    }, new Map());

    (async () => {
        await fs.mkdir("backup", {recursive: true});
        console.log("old files are moved into backup")

        await Promise.all([...overrideFiles.entries()].map(async ([filePath, positions]) => {
            let remainContent = (await fs.readFile(filePath)).toString()
            let finalContent = ""
            let lastRow = 1;
            positions.forEach(({row, col}) => {
                let relativeRow = row - lastRow
                lastRow = row;

                let offset = 0

                while (relativeRow-- > 0) {
                    offset = remainContent.indexOf("\n", offset + 1)
                }
                offset += 1
                finalContent += remainContent.slice(0, offset)
                remainContent = remainContent.slice(offset)

                offset = col - 1
                {
                    const errorLineContent = remainContent.slice(0, offset)
                    const asyncPos = errorLineContent.indexOf("async ")
                    const hasAsync = (asyncPos > -1 && asyncPos < col)
                    const fixedLineContent = errorLineContent.slice(0, hasAsync ? asyncPos : col) + "override " + errorLineContent.slice(hasAsync ? asyncPos : col)
                    finalContent += fixedLineContent;
                }
                remainContent = remainContent.slice(offset)
            })

            finalContent += remainContent;

            await fs.cp(filePath, path.join("backup", filePath))
            await fs.writeFile(filePath, finalContent)
        }))
    })()
}