TSConf 2019: Just Use Any - How to Win Colleagues and Influence Your Boss

https://www.youtube.com/watch?v=p5Hwb1YbNMY

TypeScript has won the hearts and minds of programmers all around the world. Unfortunately, your deadlines are due yesterday, your boss is unconvinced, and your team remains skeptical. What's a TypeScript enthusiast to do? Join me on a journey of self-discovery: we'll learn what it means to lead by influence and level up our effectiveness as engineers. Then, an exploration of the value to engineering and business brought about by type systems (with some math to prove it). To tie it all together, we'll explore this through the lens of real world stories from Netflix, where we use TypeScript to modernize filmmaking.

Transcript

1. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   Just Use Any
   How to Win Colleagues and Influence Your Boss
   Lauren Tan (she/her)
   PRESENTED BY
   unknown
   

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2. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   type Spiderman
   SKIP INTRO
   

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3. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   Who cares
   about "influence"?
   

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4. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   I used to struggle
   with communicating
   my ideas.
   

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5. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   Everything looked
   like a nail, and all I had
   was a hammer.
   

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6. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   I tried to sell all
   the wrong things.
   My manager didn't care
   for it.
   

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7. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   These were not
   problems that needed
   solving.
   

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8. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   My job is to
   solve problems,
   not (just) write code.
   

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9. sugarpirate_ poteto
   Just Use Any: How to Win Colleagues and Influence Your Boss
   TSConf 2019, Seattle WA
   I was being held
   back by my inability to
   influence. Something
   had to change.
   

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10. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    them, but someone who makes others
    A 10x engineer isn't someone
    KATE HEDDLESTON
    who is 10x better than those around
    around them 10x better.
    

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11. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Type systems at
    ${work}.
    

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12. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    https://jobs.netflix.com/
    

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13. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Studio UI.
    

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14. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Studio UI
    Foundations.
    react
    redux*
    Apollo GraphQL
    TypeScript
    gatsby
    lerna
    yarn
    ???
    Top secret stuff
    Designed by Sophinie Som
    https://jobs.netflix.com/jobs/870589
    

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15. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    TypeScript.
    GraphQL.
    gRPC.
    JVM.
    

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16. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Making the case for
    typed JavaScript at
    Netflix.
    

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17. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Improve developer
    productivity.
    Making the case for typed JavaScript at Netflix.
    

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18. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Reduce bugs.
    Making the case for typed JavaScript at Netflix.
    

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19. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Performance*.
    Making the case for typed JavaScript at Netflix.
    

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20. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    https://mrale.ph/blog/2015/01/11/whats-up-with-monomorphism.html
    

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21. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    End to end type safety.
    Making the case for typed JavaScript at Netflix.
    

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22. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    We also considered the
    risks of adopting typed
    JavaScript.
    Making the case for typed JavaScript at Netflix.
    

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23. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    TypeScript checked most
    of those boxes.
    Making the case for typed JavaScript at Netflix.
    

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24. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Building a community.
    

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25. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    

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26. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    MY CODEBASE
    AFTER 3.7 LANDS
    yay!?.optional!?.chaining
    

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27. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    

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28. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    • Matt Greer - Type Widening
    • Ryan Anklam - TVUI's
    Experience with TypeScript

    Tim Branyen - Experience
    Using TypeScript in AppDirectory
    • Jordan Gensler - How To Type
    Everything
    • Danny Cochran - TypeScript with
    Maple
    • Randy Wenas - TS at Employee
    Apps
    • Emily Dobervich - TypeScript is
    just JavaScript
    • Young Min Kim -
    Using TypeScript Today
    Passionate
    TypeScript
    users at
    Netflix.
    Building a community.
    

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29. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    "Prefer statically typed [!!...] for better
    developer productivity"
    

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30. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    TypeScript.
    GraphQL.
    gRPC.
    JVM.
    

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31. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    First things first.
    

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32. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Hold your horses
    

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33. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    me: *returns from TSConf*
    nobody:
    me: everything is now strict: true
    

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34. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What problem are you
    trying to solve?
    

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35. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Accept that there may
    be many solutions to
    the problem.
    

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36. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Don't make this about
    the language.
    

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37. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Make it about the
    organization.
    

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38. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What is the impact
    of the change?
    

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39. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What's the sustainability
    of the language?
    

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40. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Influence is...
    

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41. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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42. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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43. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    

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44. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    

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45. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Know your context.
    Know your environment.
    Know your audience.
    What frustrates them?
    What motivates them?
    Context.
    

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46. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Your peers might be
    frustrated by bugs, fear
    of refactoring.
    Your boss might be
    frustrated about a lack of
    velocity, or poor user
    satisfaction.
    Context.
    

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47. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Your peers might be
    motivated by better
    productivity, confidence
    about code changes.
    Your boss might be
    motivated by being able
    to hire, meeting KPIs/
    OKRs, improving
    velocity.
    Context.
    

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48. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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49. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What is the bigger
    story?
    What is the common
    ground?
    Connecting
    the dots.
    

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50. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Are there other teams
    using TypeScript?
    What other typed
    technologies are in use?
    What are you unlocking
    for the wider org?
    Connecting
    the dots.
    

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51. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    How does my company
    make money?
    What's getting in the
    way of that?
    What could we do to
    improve our ability to do
    so?
    Connecting
    the dots.
    

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52. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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53. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    The essence of strategy
    MICHAEL PORTER
    is knowing what not to do.
    

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54. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Be narrowly focused on
    just a few things.
    Choice.
    

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55. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Don't try to force
    everyone to change.
    Don't expand scope
    beyond what is
    necessary.
    Be clear on what you're
    not doing.
    Choice.
    

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56. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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57. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Cultivate empathy.
    Build credibility.
    Build trust.
    Be genuine.
    Be OK with "no".
    Connection.
    

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58. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Be transparent about
    your motivations. It's OK
    if it's purely engineering
    driven.
    Why should others care
    about the problem you're
    trying to solve?
    Connection.
    

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59. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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60. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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61. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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62. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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63. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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64. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Context.
    Connecting the dots.
    Choice.
    Connection.
    Credibility*
    

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65. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Why should I care
    about type systems?
    

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66. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    It's better to find the errors
    ANDERS HEJLSBERG
    before the space shuttle flies.
    https://youtu.be/wYgSiFaYSSo
    

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67. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Most languages are
    typechecked.
    

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68. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Some of us only
    get to typecheck in
    production.
    

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69. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Using TypeScript
    effectively.
    

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70. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What are types
    anyway?
    

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71. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    A type is the set of
    possible values for
    a term.
    

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72. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    string
    type T1 = string
    'தจ'
    'español'
    '೔ຊޠ'
    'tsconf'
    '2019'
    '✌'
    

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73. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    number
    number
    type T2 = number
    2019
    NaN
    Infinity
    123.45
    0x11
    123e-1
    
    

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74. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    type T3 = string | number
    'தจ'
    'español'
    '೔ຊޠ'
    'tsconf'
    '2019'
    '✌'
    2019
    NaN
    Infinity
    123.45
    0x11
    123e-1
    number
    string
    

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75. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Why should I care
    about the cardinality
    of a type?
    cardinality · number of elements of the set
    

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76. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    number
    type T4 = 'TSConf' | 'dotJS' | 'React Rally'
    Cardinality: 3
    'TSConf'
    'dotJS'
    'React Rally'
    

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77. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    number
    type Option = None | Some
    Cardinality: 2
    None
    Some
    https://github.com/gcanti/fp-ts
    

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78. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    number
    Cardinality: Infinity
    undefined
    null
    number
    string
    symbol
    array
    object
    type T5 = unknown
    

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79. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    type T5 = unknown
    *slaps roof of typescript* this
    bad type can fit so many types
    in it
    

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80. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    When we restrict what we can do,
    RUNAR BJARNASON
    it's easier to understand what we
    can do.
    https://youtu.be/GqmsQeSzMdw
    

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81. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Precise types =
    Less bugs.
    Use unknown if you need it, just know what the tradeoffs are.
    

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82. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    function toString(x: T): string { return x.toString(); }
    toString(undefined);
    toString(null);
    function toString(x: undefined): string
    function toString(x: null): string
    

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83. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    string
    number
    object
    array
    symbol
    void
    string
    Uncaught TypeError
    Possible Domains Possible Codomains
    function toString(x: T): string
    

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84. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    function toString(x: NonNullable): string { return x.toString(); }
    toString(undefined);
    toString(null);
    

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85. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    function toString(x: NonNullable): string { return x.toString(); }
    toString(undefined);
    toString(null);
    

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86. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    function toString(x: NonNullable): string { return x.toString(); }
    toString(undefined);
    toString(null);
    Argument of type 'undefined' is not assignable
    to parameter of type 'never'.
    Argument of type 'null' is not assignable
    to parameter of type 'never'.
    

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87. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    string
    number
    object
    array
    symbol
    void
    string
    Uncaught TypeError
    Possible Domains Possible Codomains
    function toString(x: NonNullable): string
    

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88. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    function toString(x: NonNullable & { toString(): string }): string {
    return x.toString();
    }
    class Foo { toString(): void {} };
    class Bar {};
    toString(new Foo());
    toString(new Bar());
    Argument of type 'Foo' is not assignable to parameter of type 'Foo & { toString(): string; }'.
    Type 'Foo' is not assignable to type '{ toString(): string; }'.
    The types returned by 'toString()' are incompatible between these types.
    Type 'void' is not assignable to type 'string'.
    

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89. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    undefined
    null
    A: Set of nullable types
    B \ A:
    Set of non-nullable types
    B: Set of all types
    string
    number
    object
    symbol
    array
    

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90. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    string
    number
    object
    symbol
    array
    NonNullable toString(): string
    A: Set of non-nullable types
    B: Set of types with toString(): string
    B & A:
    Set of non-nullable types
    with toString(): string
    Bar
    

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91. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    https://youtu.be/cj07Fwzamy0
    

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92. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Types on every desk, in
    every home, for every JS
    developer.
    https://github.com/microsoft/TypeScript/issues/33118
    

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93. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    

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94. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    https://blog.johnnyreilly.com/2019/10/definitely-typed-movie.html
    

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95. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    

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96. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    

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97. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Make people
    around you 10x
    better.
    

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98. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    What problem are you
    trying to solve?
    

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99. sugarpirate_ poteto
    Just Use Any: How to Win Colleagues and Influence Your Boss
    TSConf 2019, Seattle WA
    Accept that there may
    be many solutions to
    the problem.
    

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100. sugarpirate_ poteto
     Just Use Any: How to Win Colleagues and Influence Your Boss
     TSConf 2019, Seattle WA
     Make it about the
     organization.
     

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101. sugarpirate_ poteto
     Just Use Any: How to Win Colleagues and Influence Your Boss
     TSConf 2019, Seattle WA
     What is the impact
     of the change?
     

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102. sugarpirate_ poteto
     Just Use Any: How to Win Colleagues and Influence Your Boss
     TSConf 2019, Seattle WA
     What's the sustainability
     of the language?
     

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103. sugarpirate_ poteto
     Just Use Any: How to Win Colleagues and Influence Your Boss
     TSConf 2019, Seattle WA
     Context.
     Connecting the dots.
     Choice.
     Connection.
     Credibility.
     

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104. Thank you.
     sugarpirate_
     poteto
     no.lol
     bit.ly/just-use-any
     

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