package.json updates, fix typos in `README.md` and add some missing type annotations tsc was complaining about#106

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darcyparker wants to merge 9 commits intogdsestimating:masterfrom

darcyparker:packagejsonUpdate

Commits on Mar 13, 2023

.node-version and .nvmrc: Use v16.
darcyparker
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package.json: Set recommended npm and node versions
darcyparker
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package-lock.json: Upgraded version version 1 lockfile to version 3
darcyparker
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package-lock.json: Fix npm audit vulnerabilities: `npm audit fix`
darcyparker
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package.json/package-lock.json: Upgrade `approvals` and `mocha` to address npm vulnerabilities of some of its transient dependencies
darcyparker
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package.json/package-lock.json: Update outdated packages
darcyparker
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packages.json: Add @types/node as dev dependency
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README.md: Fix typos in instructions
darcyparker
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Add missing type annotations. Some were specified in jsdocs. Typescript services was complaining they were undefined
darcyparker
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