Add types for zdog

[demensky]

Please fill in this template.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.) All Travis CI builds are failing due to "Dependency form-data not in whitelist" #36889
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).

If adding a new definition:

• The package does not already provide its own types, or cannot have its .d.ts files generated via --declaration
• If this is for an NPM package, match the name. If not, do not conflict with the name of an NPM package.
• Create it with dts-gen --dt, not by basing it on an existing project.
• tslint.json should be present, and tsconfig.json should have noImplicitAny, noImplicitThis, strictNullChecks, and strictFunctionTypes set to true.

[typescript-bot]

👋 Hi there! I’ve run some quick performance metrics against master and your PR. This is still an experiment, so don’t panic if I say something crazy! I’m still learning how to interpret these metrics.

Let’s review the numbers, shall we?

These typings are for a package that doesn’t yet exist on master, so I don’t have anything to compare against yet! In the future, I’ll be able to compare PRs to zdog with its source on master.

Comparison details 📊

Batch compilation
Type count	10578
Assignability cache size	34458
Subtype cache size	5
Identity cache size	3
Language service measurements
Samples taken	476
Identifiers in tests	476
getCompletionsAtPosition
Mean duration (ms)	373.7
Median duration (ms)	371.5
Mean CV	14.0%
Worst duration (ms)	483.6
Worst identifier	canvas
getQuickInfoAtPosition
Mean duration (ms)	362.9
Median duration (ms)	359.4
Mean CV	13.6%
Worst duration (ms)	492.2
Worst identifier	Shape
System information
Node version	v10.16.0
CPU count	2
CPU speed	2.294 GHz
CPU model	Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
CPU Architecture	x64
Memory	6.8 GiB
Platform	linux
Release	4.15.0-1047-azure

---

If you have any questions or comments about me, you can ping @andrewbranch. Have a nice day!

[typescript-bot]

@demensky Thank you for submitting this PR!

Because this is a new definition, a DefinitelyTyped maintainer will be reviewing this PR in the next few days once the Travis CI build passes.

In the meantime, if the build fails or a merge conflict occurs, I'll let you know. Have a nice day!

[typescript-bot]

Updated numbers for you here from be90de5:

These typings are for a package that doesn’t yet exist on master, so I don’t have anything to compare against yet! In the future, I’ll be able to compare PRs to zdog with its source on master.

Comparison details 📊

Batch compilation
Type count	10578
Assignability cache size	34458
Subtype cache size	5
Identity cache size	3
Language service measurements
Samples taken	476
Identifiers in tests	476
getCompletionsAtPosition
Mean duration (ms)	340.3
Median duration (ms)	338.9
Mean CV	14.8%
Worst duration (ms)	425.6
Worst identifier	Box
getQuickInfoAtPosition
Mean duration (ms)	332.6
Median duration (ms)	331.4
Mean CV	14.7%
Worst duration (ms)	445.3
Worst identifier	y
System information
Node version	v10.16.0
CPU count	2
CPU speed	2.294 GHz
CPU model	Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
CPU Architecture	x64
Memory	6.8 GiB
Platform	linux
Release	4.15.0-1047-azure

[andrewbranch]

Nice work with the JSDoc and the tests 👍