Draw doc

[lzxue]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

[tests-checker]

Could you please add tests to make sure this change works as expected?

[lgtm-com]

This pull request introduces 2 alerts when merging 865e1fe into 12fefa3 - view on LGTM.com

new alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 2 alerts when merging 998ca7c into e5860d7 - view on LGTM.com

new alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 2 alerts when merging 0b83a3b into e53684a - view on LGTM.com

new alerts:

• 2 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging c1a395b into ed934a0 - view on LGTM.com

new alerts:

• 3 for Unused variable, import, function or class

fixed alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging 74ffccc into ed934a0 - view on LGTM.com

new alerts:

• 3 for Unused variable, import, function or class

fixed alerts:

• 1 for Unused variable, import, function or class